The UCLA Music Library's Archive of Popular American Music is a research collection covering the history of popular music in the United States from 1790 to the present. The collection, fully accessible at the item level through the UCLA Library Orion2 catalog, is one of the largest in the country, numbering almost 450,000 pieces of sheet music, anthologies, and arrangements for band and orchestra. The collection also includes 62,500 recordings on disc, tape, and cylinder.

Particular strengths within UCLA Music Library's twentieth-century holdings include music for the theater, motion pictures, radio and television, as well as general popular music, country, rhythm and blues, and rock songs.

The Digital Archive of Popular American Music is an initiative designed to provide access to digital versions of the sheet music, and performances of the songs now in the public domain.