Abstract The Oswald Jonas memorial collection combines the papers of the Austrian music theorist Heinrich Schenker (1868-1935) with the papers of Oswald Jonas (1897-1978), a distinguished Schenker pupil and loyal disciple. Added to these are the papers of Moriz Violin (1879-1956), concert pianist and Schenker's closest friend, including the monumental Schenker-Violin correspondence extending from 1896 to 1935. The total collection comprises about 75,000 leaves of manuscript largely unpublished,...