The Mischa Schneider Collection of Test Pressing Recordings contains fifty-one sound recordings on 12-inch discs. The content includes eighteen recordings of performances by the Budapest String Quartet and twelve recordings issued by the Marlboro Recording Society.

The collection of Slee Lecture Recital Recordings contains 94 reel to reel tapes of lectures by the named Slee Visiting Lecturer in the Music Department at the State University of New York at Buffalo.