The Song Index features over 150,000 citations that lead users to over 2,100 song books spanning more than a century, from the 1880s to the 1990s. The songs cited represent a multitude of musical practices, cultures, and traditions, ranging from ehtnic to regional, from foreign to American, representing every type of song: popular, folk, children's, political, comic, advertising, protest, patriotic, military, and classical, as well as hymns, spirituals, ballads, arias, choral symphonies, and other larger works. This comprehensive volume also includes a bibliography of the books indexed; an index of sources from which the songs originated; and an alphabetical composer index.

Notes and Sources to Folk Songs of the Catskills, also published by the State University of New York Press, is the companion volume to Folk Songs of the Catskills. It contains extensive reference notes that exemplify and support detailed citations in the commentary preceding each song. The book also includes a comprehensive list of sources, including books, broadsides or pocket songsters, disc recordings, music publications, periodicals, tape archives, and other miscellaneous material, as well as information on variants, adaptations, comments or references, texts, and tunes. These notes are designed to provide succinct reference information.