The collection contains primarily sound recordings of performances of Jascha Heifetz, but it also includes recordings of other artists, some of whom were collaborators with Heifetz, as well as one recording of his teacher, Leopold Auer. There are 924 recordings on 10" and 12" sound discs, including test pressings, instantaneous discs and commercially released records. Most of the discs are 78 rpm recordings, but there are also a few 33 1/2 rpm 12" discs. In addition to audio discs, the collection contains 88 recordings on magnetic tape which consist of 1/4" tape on 10" reels. 61 of the tapes, made between December 14, 1954 and November 21, 1972, include date information on the boxes. 27 of the tapes are in boxes which are undated; however, recording dates for most of those tapes have been provided in the donor's inventory.