Oak, Kil-Sung (1942– )—South Korea
Teachers: Ussachevsky, Vladimir; Wen-chung, Chou; Wolpe, Stefan
Students: Unknown
Oakeley, Herbert (1830–1903)—England
Teachers: Elvey, Stephen
Students: Edwards, Julian
Oakes, Rodney Harland (1937– )—USA
Teachers: McBride, Robert; Vazzanna, Anthony; Ward-Steinman, David
Students: Chyrzynski, Marcel
Ober, Arlon (1943–2004)—USA
Teachers: Unknown
Students: Unknown
Oberhoffer, Heinrich (1824–1885)—Luxembourg
Teachers: Unknown
Students: Oberhoffer, Robert Werner
Oberhoffer, Robert Werner (1854–1916)—Germany, England
Teachers: Oberhoffer, Heinrich
Students: Marsh, William J.
Obermüller, Karola (1978– )—Germany
Teachers: Anderson, Julian; Birtwistle, Harrison; Blumenthaler, Volker; Brandmüller, Theo; Czernowin, Chaya; Davidovsky, Mario; Hölszky, Adriana; Lindberg, Magnus; Rands, Bernard
Students: Elrod, Jonah
Oberson, René (1945– )—Switzerland
Teachers: Balmer, Luc; Dutilleux, Henri; Langlais, Jean
Students: Mettraux, Laurent
Oberstadt, Carl (1871–1940)—Netherlands
Teachers: Bargiel, Woldemar; Schumann, Clara; Schumann, Robert
Students: Bijvanck, Henk; van Katwijk, Paul
Oberthür, Karl (1819–1895)—Germany
Teachers: Röder, Georg Valentin
Students: Unknown
Obiols, Mariano (1809–1888)—Spain
Teachers: Mercadante, Saverio
Students: Unknown
Oboussier, Robert (1900–1957)—Belgium, Switzerland
Teachers: Andreae, Volkmar; Jarnach, Philipp
Students: Unknown
O’Boyle, Sean (1963– )—Australia, USA
Teachers: Unknown
Students: Unknown
Obradovic, Aleksandar (1927–2001)—Serbia
Teachers: Berkeley, Lennox; Logar, Mihovil; Ussachevsky, Vladimir
Students: Unknown
Obrecht, Eldon (1920–2011)—USA
Teachers: Clapp, Philip Greeley
Students: Sollberger, Harvey
Obrecht, Jacob (~1457–1505)—Belgium
Teachers: Busnoys, Antoine
Students: Unknown
Obretenov, Svetoslav (1909–1955)—Bulgaria
Teachers: Self-taught
Students: Unknown
O’Brien, Charles (1882–1968)—Scotland
Teachers: MacCunn, Hamish
Students: Unknown
O’Brien, Eugene (1945– )—USA
Teachers: Beadell, Robert; Eaton, John; Erb, Donald; Xenakis, Iannis; Zimmermann, Bernd Alois
Students: Alexander, Kathryn; Cox, Cindy; Demos, Nickitas J.; Dirié, Gerardo; Dzubay, David; Fitch, Keith; Gumert, Lynn; Haber, Yotam; Hamilton, Bruce; Holland, Anthony; Hopkins, Christopher; Kasparov, Andrey; Kaufman, Christopher; Klein, Joseph; Kleinsasser, William; Mobberley, James; Osterfeld, Paul; Paterson, Robert; Pérez-Velázquez, Ileana; Satterwhite, Marc; Simonson, Eric; Simpson, Andrew Earle; Stine, Robert Everett; Supko, John; Zupko, Mischa
Obst, Michael (1955– )—Germany
Teachers: Humpert, Hans-Ulrich
Students: Zivkovic, Djuro
Obukhov, Nikolai (1892–1954)—Russia, France
Teachers: Ravel, Maurice; Steinberg, Maximilian; Tcherepnin, Nikolai
Students: Unknown
Očenáš, Andrej (1911–1995)—Slovakia
Teachers: Moyzes, Alexander; Novák, Vítězslav
Students: Kolkovich, Joseph; Parík, Ivan
Ochs, Siegfried (1858–1929)—Germany
Teachers: Kiel, Friedrich; Rudorff, Ernst; Urban, Heinrich
Students: Erb, John Warren; Vinaver, Chemjo; Wagner-Régeny, Rudolph
Ockeghem, Johannes (~1410–1497)—Belgium, France
Teachers: Binchois, Gilles
Students: des Prez, Josquin; Weerbeke, Gaspar van
O’Connell, Kevin (1958– )—Northern Ireland
Teachers: Friel, Redmond; Hoeg, Michael
Students: McCormack, Chris
O’Conner, Mark (1961– )—USA
Teachers: Self-taught
Students: Unknown
Odagescu, Irina (1937– )—Romania
Teachers: Ciortea, Tudor; Ligeti, György; Stockhausen, Karlheinz; Xenakis, Iannis
Students: Unknown
Odak, Krsto (1888–1965)—Croatia
Teachers: Hartmann von An der Lan-Hochbrunn, Paul; Novák, Vítězslav
Students: Hercigonja, Nikola; Makedonski, Kiril
Odam, George (1938– )—England
Teachers: Unknown
Students: Duggan, Kevin
Odd, Conny (1916–1986)—Germany
Teachers: David, Johann Nepomuk; Raphael, Günter; Straube, Karl; Thomas, Kurt
Students: Heyn, Walter Thomas; Lischka, Rainer; Treibmann, Karl Ottomar
Oddone Sulli-Rao, Elisabetta (1878–1972)—Italy
Teachers: Cervi, Luigi; Coronaro, Gaetano
Students: Unknown
Odegard, Peter S. (1929–2009)—USA
Teachers: Cushing, Charles; Hindemith, Paul; Imbrie, Andrew; Sapp, Allen; Sessions, Roger; Thompson, Randall
Students: Melbinger, Timothy; Mumford, Jeffrey; Woodrich, Dennis
O’Dell, Adam D. (1992– )—USA
Teachers: Dietz, Christopher; Dunker, Amy; Kuehn, Mikel; Shrude, Marilyn
Students: Unknown
Odero, Alejandro (1851–1897)—Spain
Teachers: Broca, Enrique; Marmontel, Antoine François
Students: Falla, Manuel de
Odoevsky, Vladimir (1804–1869)—Russia
Teachers: Field, John; Miller, I.G.
Students: Unknown
O’Donnell, Richard (1937– )—USA
Teachers: Adler, Samuel
Students: Unknown
O’Donnell, Walton (1887–1939)—India, England
Teachers: Unknown
Students: Dunn, Vivian
O’Dwyer, Robert (1862–1949)—Ireland
Teachers: Unknown
Students: Unknown
Oehler, Dale Dixon (1941– )—USA
Teachers: Hervig, Richard
Students: Unknown
Oehmler, Leo (1867–1930)—USA
Teachers: Radecke, Robert; Sauret, Émile
Students: Cadman, Charles Wakefield
Oehring, Helmut (1961– )—Germany
Teachers: Goldmann, Friedrich; Katzer, Georg
Students: Unknown
Offenbach, Jacques (1819–1880)—Germany, France
Teachers: Halévy, Fromental
Students: Unknown
O’Gallagher, Eamonn (1906–1982)—Ireland
Teachers: Unknown
Students: Kinsella, John
Oganesyan, Edgar (see Hovhanisian, Edgar)
Ogdon, John (1937–1989)—England
Teachers: Hall, Richard; Petri, Egon
Students: Unknown
Ogdon, Will (Wilbur) (1921–2013)—USA
Teachers: Heiden, Bernhard; Honegger, Arthur; Krenek, Ernst; Leibowitz, René; Sessions, Roger
Students: Beeler, Charles Alan; Fulkerson, James; Grusin, Martin; Keyes, Nelson; Spizizen, Louise; Winsor, Phil
Ogihara, Toshitsugu (1910–1992)—Japan
Teachers: Matsudaira, Yoritsune; Tcherepnin, Alexander
Students: Unknown
Oginski, Michal Kleofas (1765–1833)—Poland, Italy
Teachers: Baillot, Pierre; Kozlovsky, Osip; Viotti, Giovanni Battista
Students: Unknown
Ogura, Roh (1916–1990)—Japan
Teachers: Fukai, Shiro; Ikenouchi, Tomojiro; Sugawara, Meiro
Students: Matsuya, Midori; Takahashi, Yuji; Zakoji, Hiroaki
O’Halloran, Sarah (1983– )—Ireland
Teachers: Alcorn, Michael; Burtner, Matthew; Coffey, Ted; Kuivila, Ron; Oliveros, Pauline; Shatin, Judith
Students: Unknown
Ohana, Maurice (1913–1992)—Morocco, France
Teachers: Casella, Alfredo; Daniel-Lesur, Jean-Yves; Lévy, Lazare
Students: Baran, Ilhan; de Chizy, Edith Canat; Pablo, Luis de
O’Hara, Geoffrey (1882–1967)—Canada, USA
Teachers: Norris, Homer
Students: Unknown
Ohki, Masao (1901–1971)—Japan
Teachers: Ishikawa, Giichi
Students: Unknown
Ohzawa, Hisato (1907–1953)—Japan
Teachers: Schoenberg, Arnold
Students: Unknown
Oianguren, Xabier (1979– )—Spain
Teachers: Unknown
Students: Unknown
Okasaka, Keiki (1940– )—Japan
Teachers: Hasegawa, Yoshio; Yamagata, Shigetaro
Students: Higaki, Tomonari; Narimoto, Rica
O’Keover, John (~1600–~1663)—England
Teachers: Unknown
Students: Unknown
Okonsar, Mehmet (1961– )—Turkey, Belgium
Teachers: Akses, Necil Kazim; Ballif, Claude; Fontyn, Jacqueline; Kodalli, Nevit
Students: Unknown
Okunev, German (1931–1973)—Russia
Teachers: Klyuzner, Boris; Shostakovich, Dmitri; Yevlakhov, Orest
Students: Vavilov, Gennady
Olah, Tiberiu (1928–2002)—Romania, Hungary
Teachers: Messner, Yevgeny; Rogal-Levitsky, Dmitri
Students: Alexandra, Liana; Badian, Maya; Berger, Christian Wilhelm; Buciu, Dan; Georgescu, Corneliu Dan; Ghezzo, Dinu; Iorgulescu, Adrian; Metianu, Lucian; Wendel, Eugen; Zorzor, Stefan
Olan, David (1948– )—USA
Teachers: Adler, Samuel; Arel, Bülent; Davidovsky, Mario; Sollberger, Harvey; Thimmig, Les; Ussachevsky, Vladimir; Wen-chung, Chou; Wuorinen, Charles
Students: Burwasser, Daniel; Chung, Yiu-Kwong; Wong, Cynthia Lee; You, Jaeseong
Ölander, Per August (1824–1886)—Sweden
Teachers: Unknown
Students: Unknown
Olbrisch, Franz Martin (1952– )—Germany
Teachers: Beyer, Frank Michael
Students: Unknown
Oldberg, Arne (1874–1962)—USA
Teachers: Leschetizky, Theodor; Middelschulte, Wilhelm; Rheinberger, Joseph
Students: Bacon, Ernst; Beecher, Carl Milton; Bocard, Cecilia Clare; Brye, Joseph; Daniel, Cyrus; Galajikian, Florence Grandland; Glasser, Albert; Goodsmith, Ruth; Hanson, Howard; LaViolette, Wesley; Van Vactor, David; Wilcox, James H.
Oldfield, W. Alan (1935– )—USA
Teachers: Boulanger, Nadia; Foss, Lukas; Harris, Roy
Students: Brosh, Thomas D.; Loarie, Philip; Schmutte, Peter; Strini, Tom; Wood, Kevin
Oldham, Arthur (1926–2003)—England, Scotland, France
Teachers: Britten, Benjamin; Howells, Herbert
Students: Unknown
Oldham, Kevin (1960–1993)—USA
Teachers: Self-taught
Students: Unknown
Oldroyd, George (1887–1956)—England
Teachers: Unknown
Students: Sowande, Fela; Wordsworth, William
Olds, William B. (1874–1948)—USA
Teachers: Unknown
Students: Severy, Violet Cavell
O’Leary, Arthur (1834–1919)—Ireland
Teachers: Bennett, William Sterndale; Hauptmann, Moritz; Moscheles, Ignaz; Plaidy, Louis; Potter, Cipriani; Richter, Ernst Friedrich
Students: Stanford, Charles Villiers
O’Leary, Jane (1946– )—USA, Ireland
Teachers: Babbitt, Milton
Students: Unknown
Olenin, Alexander (1865–1944)—Russia
Teachers: Erdmannsdörfer, Max; Pabst, Paul
Students: Unknown
Oliphant, Thomas (1799–1873)—Scotland
Teachers: Unknown
Students: Unknown
Oliveira, Fernando Correa de (1921–2004)—Portugal
Teachers: Carneyro, Claudio; Vianna da Motta, José
Students: Unknown
Oliveira, João Pedro (1959– )—Portugal
Teachers: Arel, Bülent; Dodge, Charles; Lessard, John Ayres; Semegen, Daria
Students: Carvalho, Sara; Omiccioli, Nicholas
Oliveira, Willy Correa de (1938– )—Brazil
Teachers: Toni, George Olivier
Students: Barnabé, Arrigo
Oliveiro, Mark (1983– )—Australia, USA
Teachers: Gibson, John; Klein, Joseph; May, Andrew; Smetanin, Michael
Students: Unknown
Oliver, Harold (1942– )—USA
Teachers: Babbitt, Milton; Cheslock, Louis; Cone, Edward; Grové, Stefans; Martino, Donald; Powell, Mel; Schuller, Gunther
Students: Heim, Sean; Roth, Jason
Oliver, Henry K. (1800–1885)—USA
Teachers: Self-taught
Students: Unknown
Oliver, Jaime E. (1979– )—Peru, USA
Teachers: Puckette, Miller
Students: Unknown
Oliver, John (1959– )—Canada
Teachers: Adams, John; Chatman, Stephen; Mather, Bruce; Rea, John
Students: Unknown
Oliver, Richard (1927–1982)—USA
Teachers: Boulanger, Nadia; Lockwood, Normand; Werle, Frederick
Students: Unknown
Oliver, Stephen (1950–1992)—England
Teachers: Johnson, Robert Sherlaw; Leighton, Kenneth
Students: Unknown
Olivero, Betty (1954– )—Israel
Teachers: Amy, Gilbert; Berio, Luciano; Druckman, Jacob; Rands, Bernard; Sadai, Yitzhak; Shidlowsky, Leon
Students: Unknown
Oliveros, Pauline (1932–2016)—USA
Teachers: Erickson, Robert; Koepke, Paul; Shifrin, Seymour
Students: Alarcon, Ximena; Bartlett, Martin; Biggs, Betsey; Blumberg, Stephen; Boehringer, Jorge; Burt, Warren; Cannon, Dwight; Carter, Ryan; Corbett, Sidney; Dargel, Corey; Dresher, Paul; Dreyblatt, Arnold; Engebretson, Mark; Erickson, Kurt; Gardner, Alexandra; Goode, Daniel; Graves, Mel; Hutchinson, Brenda; Jeffers, Ron; Jensen, Marc; Jones, David Evan; Lam, Bun-Ching; Lillios, Elainie; Louie, Alexina; Lowrey, Norman; Marriott, Richard; McCarty, Frank; Mizelle, Dary John; Noonan, Brenna; Nordschow, Randy; O’Halloran, Sarah; Reason, Dana; Rubin, Anna; Schocker, Edward; Segel, Jonathan; Siskind, Paul; Strange, Allen; Struble, John Warthen; Von Gunden, Heidi; Wong, Betty Anne; Woodrich, Dennis
Ollivier, Louis (see Carol-Bérard)
Olmeda, Federico (1865–1909)—Spain
Teachers: Sanz, Damián
Students: Collet, Henri
Olofsson, Kent (1962– )—Sweden
Teachers: Gefors, Hans; Hillborg, Anders; Martinsson, Rolf; Nordentoft, Anders; Rydberg Bo; Sørenson, Bent; Wishart, Trevor
Students: Unknown
Olsen, Carl Gustav Sparre (see Olsen, Sparre)
Olsen, Loran (1930– )—USA
Teachers: Bezanson, Philip; Boulanger, Nadia; Comelli, Gaetano; Pyle, Francis
Students: Unknown
Olsen, Ole (1850–1927)—Norway
Teachers: Reinecke, Carl; Richter, Ernst Friedrich
Students: Tonning, Gerard
Olsen, Poul Rovsing (1922–1982)—Denmark
Teachers: Boulanger, Nadia; Jeppesen, Knud
Students: Unknown
Olsen, Sparre (1903–1984)—Norway
Teachers: Brustad, Bjarne; Butting, Max; Grainger, Percy; Hjellemo, Ole; Valen, Fartein
Students: Unknown
Olshanskij, Anatoli (1956– )—Russia
Teachers: Unknown
Students: Unknown
Olson, Jennifer (20th–21st century)—USA
Teachers: Carl, Robert; Gwiazda, Henry; Koonce, Paul; Schelle, Michael; Sellars, James; Steen, Ken
Students: Unknown
Olson, Lynn Freeman (1938–1987)—USA
Teachers: Unknown
Students: Unknown
Olson, Michael (1980– )—USA
Teachers: Unknown
Students: Anderson, Aaron
Olson, Mike (1974– )—USA
Teachers: Argento, Dominick; Fetler, Paul; Stokes, Eric; Ultan, Lloyd
Students: Unknown
Olson, Tawnie (1974– )—Canada
Teachers: Bell, Allan; Bresnick, Martin; Chan, Ka Nin; Eagle, David; Jordan, William; Laderman, Ezra; Lam, Bun-Ching; McCubbin, Janice Thoreson; Rapoport, Alexander; Schwantner, Joseph; Ziporyn, Evan
Students: Pergiovanni, Andrew
Olsson, Otto (1879–1964)—Sweden
Teachers: Dente, Joseph
Students: Eriksson, Nils; Hallnäs, Hilding; Sandén, Uno
Oltra i Ferrer, Manuel (1922– )—Spain
Teachers: Unknown
Students: Brotons, Salvador
Omiccioli, Nicholas (1982– )—USA
Teachers: Bevelander, Brian; Chen, Yi; Hartke, Stephen; Long, Zhou; Mobberley, James; Oliveira, João Pedro; Rudy, Paul
Students: Unknown
Oña, Erik (1961– )—Argentina, USA
Teachers: Unknown
Students: Gibson, Mara; Miyama, Chikashi; Sazegari, Ramteen
Onderdonk, Henry (1928–2001)—USA
Teachers: Unknown
Students: Celona, John; Gibson, Jon; Loy, Gareth; Miller, Jeffrey; Winges, Mark
Ondříček, František (1857–1922)—Czechia, Austria
Teachers: Bennewitz, Antonin; Massart, Lambert
Students: Feldman, Ludovic; Navrátil, Karel
O’Neal, Barry (1942– )—USA
Teachers: Arslanian, Artin; Norden, Hugo; Read, Gardner
Students: Unknown
O’Neill, Charles (1882–1964)—Ireland, Canada
Teachers: Peace, Albert Lister; Sanders, Herbert
Students: Forcucci, Samuel
O’Neill, Norman (1875–1934)—Ireland, England
Teachers: Knorr, Iwan; Somervell, Arthur
Students: Williams, Charles
Onishi, Yoshiaki (1981– )—Japan, USA
Teachers: ‘; Bresnick, Martin; Coburn, Robert; Francesconi, Luca; Hillborg, Anders; Hosokawa, Toshio; Ichiyanagi, Toshi; Kernis, Aaron Jay; Klingbeil, Michael; Lerdahl, Fred; Lévy, Fabien; Murail, Tristan; Rose, François; Stroppa, Marco
Students: Unknown
Onofri, Alessandro (1874–1932)—Italy
Teachers: Mascagni, Pietro; Rossi, Giovanni Gaetano
Students: Unknown
Onslow, George (1784–1853)—France
Teachers: Dussek, Jan Ladislav; Hüllmandel, Nicolas Joseph; Reicha, Anton
Students: Unknown
Ontrop, Lodewijk (1875–1941)—Belgium
Teachers: Benoit, Peter; Blockx, Jan; Tilborghs, Joseph
Students: Schampaert, Jozef; Verbesselt, August
Opienski, Henryk (1870–1942)—Poland, Switzerland
Teachers: d’Indy, Vincent; Urban, Heinrich; Żeleński, Władysław
Students: Poradowski, Stefan Boleslaw
Oppedisano, Marco (1971– )—USA
Teachers: Brunner, George; Creshevsky, Noah; Dodge, Charles; León, Tania; Musgrave, Thea; Weinberg, Henry
Students: Unknown
Oppel, Reinhard (1878–1941)—Germany
Teachers: Schenker, Heinrich
Students: Wirth, Helmut
Opperman, Chris (1978– )—USA
Teachers: Unknown
Students: Unknown
Oppido, Vincent (1986– )—USA
Teachers: Camphouse, Mark; Maiello, Anthony; McNeely, Joel; Smalley, Jack
Students: Unknown
Orbán, György (1947– )—Romania, Hungary
Teachers: Eisikovits, Max; Toduta, Sigismund
Students: Unknown
Ørbeck, Anne-Marie (1911–1996)—Norway
Teachers: Drouker, Sandra; Höffer, Paul; Lange, Gustav Fredrik; Lothar, Mark; Milhaud, Darius
Students: Unknown
Orbelyan, Konstantin (1928– )—Armenia, USA
Teachers: Mirzoyan, Edvard
Students: Unknown
Orbón, Benjamin (1877–1944)—Spain, Cuba
Teachers: Unknown
Students: Orbón, Julián
Orbón, Julián (1925–1991)—Spain, Cuba, Mexico, USA
Teachers: Ardévol, José; Copland, Aaron; Orbón, Benjamin
Students: Cordero, Ernesto; Estrada, Julio; Mata, Eduardo
Orchard, W. Arundel (1867–1961)—England, Australia
Teachers: Unknown
Students: Unknown
Ordenstein, Heinrich (1856–1921)—Germany
Teachers: Paul, Oskar; Reinecke, Carl
Students: Unknown
Ordinaire, Raoul (1843–1898—France
Teachers: De Mol, Pierre
Students: Unknown
Ordoñez, Karl von (1734–1786)—Austria
Teachers: Unknown
Students: Unknown
Ore, Charles (1936– )—USA
Teachers: Beck, Theodore; Matthews, Thomas; Roberts, Myron
Students: Unknown
Orefice, Giacomo (1865–1922)—Italy
Teachers: Busi, Alessandro; Mancinelli, Luigi
Students: de Sabata, Victor; Mainardi, Enrico; Rocca, Lodovico
O’Reilly, John (1940– )—USA
Teachers: Frackenpohl, Arthur; Washburn, Robert
Students: Unknown
Orem, Preston Ware (1865–1938)—USA
Teachers: Clarke, Hugh Archibald; Jarvis, Charles H.
Students: Unknown
Orenstein, Joyce (1939– )—USA
Teachers: Davidovsky, Mario; Moevs, Robert; Wuorinen, Charles; Ytterhus, Rolv
Students: Unknown
Orff, Carl (1895–1982)—Germany
Teachers: Beer-Walbrunn, Anton; Cortolezis, Fritz; Kaminski, Heinrich; Pfitzner, Hans
Students: Bissell, Keith; Bucht, Gunnar; Carr, Edwin; Derr, Ellwood; Eder, Helmut; Egk, Werner; Killmayer, Wilhelm; Kurzbach, Paul; Lechner, Konrad; Lindeman, Osmo; Mamangakis, Nikos; Marx, Karl; Maud, Arthur; Redlich, Hans; Riedl, Josef Anton; Sörenson, Torsten; Sutermeister, Heinrich
Orgad, Ben-Zion (1926–2006)—Germany, Israel
Teachers: Ben-Haim, Paul; Copland, Aaron; Fine, Irving; Shapero, Harold; Tal, Josef
Students: Unknown
Orland, Henry (1918–1999)—USA
Teachers: Donato, Anthony; Walter, Bruno
Students: Unknown
Orlandi, Ferdinando (1774–1848)—Italy
Teachers: Paer, Ferdinando; Tritto, Giacomo
Students: Unknown
Örnemark, Sebastian (~1990– )—Sweden, USA
Teachers: Broughton, Bruce; Schyman, Garry; Smalley, Jack; Young, Christopher
Students: Unknown
Ornstein, Leo (1893–2002)—Russia, USA
Teachers: Goetschius, Percy; Puchalsky, Vladimir
Students: Imbrie, Andrew
Orowan, Thomas (1940– )—USA
Teachers: Norden, Hugo; Read, Gardner; Sydeman, William Jay
Students: Unknown
Orr, Buxton (1924–1997)—Scotland, England
Teachers: Frankel, Benjamin
Students: Regan, Michael
Orr, Charles Wilfred (1893–1976)—England
Teachers: Delius, Frederick
Students: Unknown
Orr, Robin (1909–2006)—Scotland, England
Teachers: Boulanger, Nadia; Casella, Alfredo; Dent, Edward Joseph
Students: Cooke, Deryck; McAllister, Rita; Warren, Raymond
Orrego-Salas, Juan (1919– )—Chile, USA
Teachers: Allende, Pedro Humberto; Baker, David N.; Copland, Aaron; Santa Cruz, Domingo; Thompson, Randall
Students: Aguilar-Ahumada, Miguel; Babcock, Michael; Bernstein, David; Bilbao, Beatriz; Botto Vallarino, Carlos; Chandler, Erwin; Gallaher, Christopher S.; Garcia, Fernando; Gebuhr, Ann Karen; Kim, Byong-Kon; Lehrman, Leonard; Lémann, Juan; Lorenz, Ricardo; Miller, Harvey Horatio; Mofsenson, Joel; Rauschenberg, Dale; Roig-Francoli, Miguel; Serendero Proust, David; Severy, Violet Cavell; Struble, John Warthen; Vayo, David; Weiner, Lawrence; Yürür, Ahmet
Orsolino, Federico (1918–1993)—Italy
Teachers: Unknown
Students: Unknown
Ortega, Sergio (1938–2003)—Chile, France
Teachers: Becerra-Schmidt, Gustavo; Falabella, Roberto
Students: Iglesias Rossi, Alejandro; Naón, Luis
Orth, John (1850–1932)—Bavaria (Germany), USA
Teachers: Deppe, Ludwig; Faisst, Immanuel; Kiel, Friedrich; Kullak, Theodor; Liszt, Franz; Scharwenka, Philipp; Weitzmann, Carl Friedrich
Students: Freeman, Ned; Parker, Horatio
Orthel, Léon (1905–1985)—Netherlands
Teachers: Juon, Paul; Wagenaar, Johan
Students: Alkema, Henk; Andriessen, Caecilia; Loevendie, Theo; Tómasson, Jónas
Ortiz, Diego (~1510–~1570)—Spain
Teachers: Unknown
Students: Unknown
Ortiz, Gabriela (1964– )—Mexico
Teachers: Emmerson, Simon; Ibarra, Federico; Lavista, Mario; Saxton, Robert
Students: Chase, Ryan; Farrell, David E.
Ortiz, Pablo (1956– )—Argentina, USA
Teachers: Davidovsky, Mario; Gandini, Gerardo; Monod, Jacques-Louis
Students: Belcastro, Richard; Guzzo, Anne Marie
Ortiz, William (1947– )—Puerto Rico, USA
Teachers: Arel, Bülent; Campos-Parsi, Héctor; Feldman, Morton; Hiller, Lejaren; Layton, Billy Jim
Students: Unknown
Ortiz de Zarate, Eliodoro (1865–1953)—Chile
Teachers: Unknown
Students: Unknown
Ortiz Gimeno, Vicente (~1987– )—Spain, USA
Teachers: Self-taught
Students: Unknown
Orto, Marbrianus de (~1460–1529)—Belgium, Netherlands
Teachers: Unknown
Students: Bruck, Arnold von
Orton, Richard (1940–2013)—USA
Teachers: Unknown
Students: Crutchley, Ian; Fischman, Rajmil; Godfrey, John
Ortwein, Carlernst (see Odd, Conny)
Ortwein, Magnus (1845–1919)—Austria
Teachers: Unknown
Students: Lechthaler, Josef
Örvarsson, Atli (1970– )—Iceland, USA
Teachers: Post, Mike
Students: Unknown
Osbon, David (1963– )—England
Teachers: Crumb, George
Students: Lambert, Richard
Osborn, Ed (1964– )—Finland, USA
Teachers: Bischoff, John; Brown, Chris; Curran, Alvin; Kuivilan, Ron; Lucier, Alvin
Students: Goeringer, Lyn
Osborn, Franz (1905–1955)—Germany, England
Teachers: Schnabel, Artur; Schreker, Franz
Students: Unknown
Osborne, George Alexander (1806–1893)—Ireland
Teachers: Fétis, François-Joseph; Kalkbrenner, Friedrich; Pixis, Johann Peter
Students: Unknown
Osborne, Nigel (1948– )—England
Teachers: Leighton, Kenneth; Rudzinski, Witold; Wellesz, Egon
Students: Adamia, Marina; Fitkin, Graham; Martin, Jennifer; Srikaranonda, Pathorn; Vaughan, Mike; Virtaperko, Olli
Osborne, Thomas (1978– )—USA
Teachers: Applebaum, Edward; Baker, Claude; Crockett, Donald; Freund, Don; Hartke, Stephen
Students: Unknown
Osborne, Willson (1906–1979)—USA
Teachers: Finney, Ross Lee; Hindemith, Paul
Students: Kaplan, Robert
Osghian, Petar (see Ozgijan, Petar)
Osieck, Hendrik Willem (1910–2000)—Netherlands
Teachers: Pauer, Max von; Rehberg, Walter
Students: Unknown
Osman, Ali (1958– )—Sudan, Egypt
Teachers: Abdel-Karim, Awatef; Abdel-Rahim, Gamal
Students: Unknown
Osmond, Harold (1869–1948)—England
Teachers: Gadsby, Henry
Students: Unknown
Oster, Ernst (1908–1977)—Germany, Austria, USA
Teachers: Unknown
Students: Berl, Christine; Korde, Shirish
Osterc, Slavko (1895–1941)—Slovenia
Teachers: Beran, Emerik; Hába, Alois; Jirák, Karel Boleslav; Novák, Vítězslav
Students: Branvičar, Matija; Ramovš, Primož; Sivic, Pavel
Osterfeld, Paul (1973– )—USA
Teachers: Erb, Donald; Fox, Frederick; O’Brien, Eugene; Sierra, Roberto; Stucky, Steven
Students: Unknown
Ostergren, Eduardo (1943– )—Brazil
Teachers: Herford, Julius; Pfautsch, Lloyd
Students: Unknown
Osterling, Eric (1926–2005)—USA
Teachers: Unknown
Students: Unknown
Österling, Fredrik (1966– )—Sweden
Teachers: Hall, Lennart; Lützow-Holm, Ole; Werle, Lars Johan
Students: Unknown
Ostinelli, Giona (1986– )—Switzerland, Italy
Teachers: Silvestri, Alan
Students: Unknown
Ostrander, Linda (1937– )—USA
Teachers: Etler, Alvin; Hoffmann, Richard; Johnston, Ben; Read, Gardner; Wood, Joseph
Students: Unknown
Ostransky, Leroy (1918–1993)—USA
Teachers: Unknown
Students: Nagy-Farkas, Peter; Rivard, William
Ostrčil, Otakar (1879–1935)—Czechia
Teachers: Fibich, Zdenek
Students: Axman, Emil; Drăgoi, Sabin; Kolessa, Mykola; Trojan, Václav; Zelinka, Jan Evangelista
O’Sullivan, Patrick (1871–1947)—USA
Teachers: Berger, Wilhelm; Scharwenka, Xaver
Students: Unknown
Oswald, Henrique (1852–1931)—Brazil
Teachers: Unknown
Students: Fernández, Oscar Lorenzo; Gallet, Luciano; Viana, Frutuoso
Oswald, John (1953– )—Canada
Teachers: Truax, Barry
Students: Unknown
Otaka, Hisatada (1911–1951)—Japan
Teachers: Marx, Joseph; Stöhr, Richard; Weingartner, Felix
Students: Hayashi, Hikaru; Ishii, Kan
Otaño, Nemesio (1880–1956)—Spain
Teachers: Arregui Garay, Vicente; Goicoechea, Vicente
Students: Ruiz-Pipo, Antonio; Tort, César
Otero, Francisco (1940– )—Spain
Teachers: Bernaola, Carmelo; Calés Pina, Francisco; Gombau, Gerardo
Students: Villa-Rojo, Jesús
Otescu, Ion Nonna (1888–1940)—Romania
Teachers: Castaldi, Alfonso; d’Indy, Vincent; Georgescu-Kiriac, Dumitru; Widor, Charles-Marie
Students: Alexandru, Tiberiu; Chiriac, Mircea; Ciortea, Tudor
Otey, Orlando (1925–2011)—Mexico, USA
Teachers: Menotti, Gian Carlo
Students: Bellamy, Marian
Otey, Wendell (1914–1992)—USA
Teachers: Unknown
Students: Dempster, Stuart; Goldsmith, Owen; Lamb, John David; Riley, Terry; Stewart, Kensey; Weber, Joseph
Othegraven, August von (1864–1946)—Germany
Teachers: Hiller, Ferdinand; Jensen, Gustav; Rheinberger, Joseph
Students: Eimert, Herbert; Gerstberger, Karl; Schwake, Theodor
Othmayr, Caspar (1515–1553)—Germany
Teachers: Lemlin, Lorenz
Students: Unknown
Otis, Philo Adams (1846–1930)—USA
Teachers: Buck, Dudley; Eddy, Clarence
Students: Unknown
Otsa, Harri (1926–2001)—Estonia
Teachers: Saar, Mart
Students: Pärt, Arvo
Otsuka, Jyun (20th century)—Japan
Teachers: Unknown
Students: Watanabe, Urato
Ott, Daniel (1960– )—Switzerland
Teachers: Huber, Klaus; Huber, Nicholas A.
Students: Unknown
Ott, Daniel P. (1975– )—USA
Teachers: Beaser, Robert; Corigliano, John; Rorem, Ned
Students: Netzer, Osnat
Ott, David (1947– )—USA
Teachers: Montecino, Alfonso
Students: Unknown
Ott, Joseph (1929–1990)—USA
Teachers: Happich, William; Harris, Roy; Ihrke, Walter; Sachsse, Hans Wolfgang
Students: Unknown
Ottaway, Alexandra (1960– )—USA
Teachers: Fitch, Keith; Lifschitz, Max; McCurdy, Dana; Noble, Jerry; Vigeland, Nils; Widdoes, Lawrence
Students: Unknown
Otte, Allen (1950– )—USA
Teachers: Brün, Herbert
Students: Barnhart, Michael R.; Ronneau, Jesse
Otte, Hans (1926–2007)—Germany
Teachers: Gieseking, Walter; Hindemith, Paul
Students: Ruzicka, Peter
Otterström, Thorvald (1868–1942)—Denmark, USA
Teachers: Menter, Sophie
Students: Bacon, Ernest
Ottman, Robert (1914–2005)—USA
Teachers: Unknown
Students: Ehle, Robert Cannon; Lanier, Gary; Phelps, James; Sperry, Don
Otto, Georg (1550–1618)—Germany
Teachers: Unknown
Students: Schütz, Heinrich
Otto, Julius (1804–1877)—Germany
Teachers: Schicht, Johann Gottfried; Weinlig, Christian Theodor
Students: Baumfelder, Friedrich; Becker, Reinhold; Gelbke, Johannes; Kretschmer, Edmund; Kotzschmar, Hermann; Kretzschmar, Hermann; Merkel, Gustav; Reichel, Friedrich; Seiss, Isidor; Wermann, Friedrich Oskar
Oudal, Robert (1930– )—USA
Teachers: Argento, Dominick; Delaney, Robert; Donato, Anthony; Fetler, Paul; George, Earl
Students: Unknown
Oudrid, Cristóbal (1825–1877)—Spain
Teachers: Self-taught
Students: Unknown
Ourgandjian, Raffi (1937– )—France
Teachers: Unknown
Students: Pascal, Robert
Ourkouzounov, Atanas (1970– )—Bulgaria
Teachers: Chassain, Olivier; Lagoya, Alexandre
Students: Unknown
Oury, Anna Caroline (1808–1880)—Germany
Teachers: Czerny, Carl
Students: Unknown
Oury, Antonio James (1800–1883)—England
Teachers: Baillot, Pierre; Fétis, François-Joseph; Kiesewetter, Raphael Georg; Kreutzer, Rodolphe; Lafont, Charles Philippe; Macfarren, George; Mori, Nicolas; Spagnoletti, Paolo
Students: Bennett, William Sterndale
Ouseley, Frederick (1825–1889)—England
Teachers: Unknown
Students: Harriss Charles A.E.; Stainer, John
Ovanin, Nikola (1911–1992)—Croatia, USA
Teachers: Elwell, Herbert; Hanson, Howard; Krenek, Ernst; Rogers, Bernard; Shepherd, Arthur
Students: Unknown
Ovchinnikov, Vyacheslav (1936– )—Russia
Teachers: Bogatyrev, Semyon; Khrennikov, Tikhon
Students: Unknown
Ovel, Tori (~1993– )—USA
Teachers: Felice, Frank; Schelle, Michael; Schmitz, Alan; Schwabe, Jonathan Clarke
Students: Unknown
Overall, Jason (1972– )—USA
Teachers: Boda, John
Students: Unknown
Overholt, Jon (~1989– )—USA
Teachers: Unknown
Students: Hauer, Brian
Overton, Hall (1920–1972)—USA
Teachers: Milhaud, Darius; Persichetti, Vincent; Riegger, Wallingford
Students: Arnold, Hubert; Collier, Ronald; Dello Joio, Justin; Fortner, Jack; Goldenberg, Billy; Hakim, Talib Rasul; Kogan, Robert; Levi, Paul Alan; Macchia, Salvatore; Moore, Carman; Nurock, Kirk; Paull, Barberi; Reich, Steve; Reilly, Jack; Schwartz, Julie; Segerstam, Leif; Shatin, Judith; Siegel, Henry; Sullivan, Timothy; Summerlin, Ed; Traver, James Ferris
Owen, Blythe (1898–2000)—USA
Teachers: Batalla, Jean; Boulanger, Nadia; Ganz, Rudolf; Gruenberg, Louis; Hanson, Howard; Noelte, Albert; Rogers, Bernard
Students: Spears, Jared
Owen, Harold (1931– )—USA
Teachers: Dahl, Ingolf; Kanitz, Ernest; Stevens, Halsey
Students: Brugh, Daniel; Cockey, Jim; Hsu, Wen-Ying; Lauridsen, Morten; McQuilkin, Terry; Reinkemeyer, Andrea; Scherr, Bernie; Short, Gregory; Smeltzer, Susan; Vigil, Mark
Owen, Jerry (1944– )—USA
Teachers: Hervig, Richard; Lewis, Peter Tod; White, Donald H.
Students: Bliss, Marilyn
Owens, Craig Alan (1970– )—USA
Teachers: Unknown
Students: Unknown
Oxinaga, Joaquin de (1719–1789)—Spain
Teachers: Unknown
Students: Unknown
Ozaita, Maria Luisa (1939– )—Spain
Teachers: Remacha, Fernando; Thybo, Leif
Students: Unknown
Ozaki, Sokichi (1915–1945)—Japan
Teachers: Moroi, Saburō
Students: Unknown
Ozgijan, Petar (1932–1979)—Croatia, Serbia
Teachers: Milošević, Predrag; Rajičić, Stanojlo
Students: Unknown
Ozi, Étienne (1754–1813)—France
Teachers: Ritter, Georg Wenzel
Students: Unknown
Ozley, Chris (~1986– )—USA
Teachers: D’Ambrosio, Mike; Grantham, Donald; Pinkston, Russell; Welcher, Dan
Students: Unknown