Contains recordings on audio cassettes of various viola performances and congresses, collected by Karen Tuttle. Some unidentified. Materials dated approximately 1950 to 1997.

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.