22. No less provocative is a drawing that depicts Schubert seated at the piano and singing, together with Josephine Fröhlich and Johann Michael Vogl. A facsimile of the original, from a sketchbook of 1827 by Ferdinand Georg Waldmüller, now housed at the Graphische Sammlung Albertina in Vienna, is shown in Franz Schubert und seine Zeit, a catalogue prepared by Otto Biba for an exhibition at the Gesellschaft der Musikfreunde (Vienna: Gesellschaft der Musikfreunde in Wien, 1978), 30; and in Schubert Studies: Problems of Style and Chronology, 142.