Contains sound recordings on 390 cassettes and 22 reels of performances from the North American New Music Festival, a series of annual festivals of contemporary art music sponsored by the University at Buffalo Department of Music from 1983 to 1993. The collection contains recordings of circa 720 musical works composed by about 334 different composers, including most of the most prominent composers of the 20th century. Many works were rehearsed and prepared with their respective composers in attendance and performers at the festival were chiefly specialists in new music.

The collection contains 249 cassettes featuring performances either by Mikhashoff or of his music, 801 non-commercial cassettes and 115 commercially-released cassettes that do not contain performances or works by Mikhashoff.

The collection contains 155 reel to reel tapes featuring performances either by Mikhashoff or of his music, 31 reels that do not contain performances or works by Mikhashoff, and 19 reels containing tape parts to accompany performances. Five LP sound recordings and nine compact discs are also included in the collection.