4. By Ulrich Konrad, for one: “While the contemplation of unfinished works of architecture, of sculpture torsos, of sketched pictures or the reading of fragmentary [literary] texts can convey characteristic aesthetic experience of some value, the performance of an unfinished composition … leaves seldom more than an unsatisfactory impression of a painful confusion, of an aesthetic deficit.” See Wolfgang Amadeus Mozart. Neue Ausgabe sämtlicher Werke [=NMA], Ser. X, Supplement; Werkgruppe 30, Bd. 4: Fragmente, ed. Ulrich Konrad (Kassel: Bärenreiter, 2002), xv (my translation).