Scope and content: Materials include recordings, souvenir brochures, show posters, sheet music, books, and periodicals, tracing American popular music and musical theater from the mid-1800s into the twenty-first century. The sheet music collection of approximately 2,500 pieces includes the oldest items (dozens from the 1800s) and is strongest for the era of 1900-1930 popular songs, the heyday of Irving Berlin, Bert Kalmar, Harry Ruby, Jerome Kern,...