Contains various scores for the viola, collected, annotated by or written by Karen Tuttle. Dated approximately 1720 to 1999. Original versions of compositions are included in the date range. Some is commercially produced music and others are handwritten music manuscripts.

Contains letters to and from students, including letters of recommendation Karen Tuttle wrote for students, and materials used for or about pedagogy, such as clippings, notes, and publications. Materials dated 1961 to 2007.

Contains the personal papers of Karen Tuttle, including letters, notes, agreements, publications, clippings, photographs, and negatives. Materials dated 1940s to 2001.

Contains newspaper and magazine articles on William Primrose and the viola. Dated approximately 1946-2009.

Contains materials related to research done by Leonard Seiff on the viola for his postgraduate degree. It includes personal correspondence between him and prominent violists. Dated 1941-1947 with the bulk of the materials being from 1947.

Contains music scores in the form of handwritten manuscript. It also contains some biographies of well-known composers. Dated approximately 1950-1999.

Contains photographs of Bernard Zaslav and his various performing ensembles, including duets and quartets. Dated 1962-1978.

Collection contains scores that were used by William Primrose during his time playing with the London String Quartet, and include his parts and fingering, 1928-1965.

Materials includes scores and manuscripts from composers, Gerard Schuman, Karen J. Griebeing, Herbert Burst, Clement Turner, and Jonathon Adler. Some scores include correspondence between Rosenblum and the composers.

Contains materials pertaining to Leonard Sieff's experience with and study of the viola. It includes newspaper articles, specialty magazines, and personal letters relating to William Primrose and the viola. Dated 1941-2009 with the bulk of the materials being from approximately 1946-1947.