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.
The Sheet Music Consortium is a group of libraries working toward the goal of building an open collection of digitized sheet music using the Open Archives Initiative Protocol for Metadata Harvesting. Harvested metadata about sheet music in participating collections is hosted by UCLA Digital Library Program, which provides an access service via this metadata to sheet music records at the host libraries. Data providers have chosen to catalog their sheet music in different ways, but a large proportion of the original sheets in participating collections has been digitized, allowing users direct access to the music itself and in many cases covers and advertisements that offer evidence of the cultural context in which the songs were published.