From the ARChive of Contemporary Music website:
The ARChive of Contemporary Music is a not-for-profit archive, music library and research center located in New York City. The ARChive collects, preserves and provides information on the popular music of all cultures and races throughout the world from 1950 to the present.
The ARC takes research requests by phone, fax and email and has a variety of for-fee services for the contemporary music scholar but you may browse the catalog for free!
"365:20..Lost in Music" by fwumpbungle @Flickr