The Livingston Gearhart Collection of Scores contains compositions and arrangements by Gearhart in published and manuscript forms, as well as sketches and incomplete works. It also contains published scores by other composers annotated by Gearhart.

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 approximately 1300 scores, half of which bear markings entered by Mikhashoff or his colleagues in preparation for performance. The collection includes manuscripts and print publications, both originals and reproductions.