Files of the organizational departments of the Ambassador Auditorium as well as audio and video recordings.

The Heifetz Collection features recordings by the violinist and a rare unpublished recording by Leopold Auer.

The Jack Lund Collection contains personal papers of Jack Lund, an avid classical music collector, as well as numerous newspaper and magazine clippings, photographs, and music books.

The William C. Lynch Dennis Brain Collection principally consists of commercial and unpublished recordings of the world renowned British horn player, Dennis Brain (1921-1957).

The Menuhin Collection contains many test pressings of Menuhin's performances as a violin soloist.

The Judith Rosen Collection consists of unpublished recordings of performances, lectures, and radio programs concerning classical music, focusing on twentieth century composition, as well as women musicians and composers.

Papers and recordings from American conductor and composer Gerhard Samuel (1924-2008), particularly from his years conducting the Oakland Symphony, Minneapolis Symphony, and University of Cincinnati Philharmonia Orchestra.

The Ken Ackerman Collection consists of broadcast recordings of live jazz performances from the 1950s and 60s, captured at various clubs in San Francisco, particularly Club Hangover.

Bob Arnold was a popular music historian and collector in Albany, California. His collection consists of his research and correspondence, and includes scrapbooks, program notes, interviews on cassette, and compilations on open reel tape drawn from his music collection. Perhaps his most successful project was about a 1930s jazz singer named Midge Williams.

Tape recordings of the Happy Jazz Band and the Jim Cullum Jazz Band covering over 30 years of the band's performances. The collection also contains performances by other noteworthy performers including Jack Teagarden and Bobby Hackett.

Open reel tape recordings of the “Annals of Jazz” radio program produced and hosted by historian and educator Richard Hadlock, broadcast on KCSM, San Mateo between 1982 and 1991.

Riverwalk Jazz: Live At The Landing educated and entertained public radio listeners with a program devoted to celebrating traditional jazz and popular music of the pre-war era.

The Mario Ancona Collection includes photographs, memorabilia, sound recordings, and more related to Ancona's career.

The Bonelli Collection includes letters, programs, scores, scrapbooks, recordings, posters, and news clippings.

Tenor Mario Chamlee sang at the leading opera houses in the United States and abroad. His wife Ruth was a soprano and noted singing teacher.

Richard Crooks was a tenor with the Metropolitan Opera Company.

Kirsten Flagstad (1895-1962) was known as the premier Wagnerian soprano of her time.

Includes correspondence and research notes related to Hickling's discography of Lehmann's performances.

The James Schwabacher Collection consists of sound recordings, correspondence, scores, scrapbooks, clippings, programs, teaching material and other papers from San Francisco philanthropist and lyric tenor James Schwabacher.

The Blanche Thebom Collection consists of scores, correspondence, publicity, production notes, and media from the mezzo-soprano's post-Met career as teacher and director.