- Musical of the Month – Sponsored by the New York Public Library, this blog features electronic editions of librettos of shows published before 1923, with commentary, photographs, video clips, recordings, and other connections to other resources. Most of the entries are supplied by the Doug Reside, Digital Curator of Performing Arts, Library of the Performing Arts, NYPL, but a number of guest posts are also included in the monthly series.
- Internet Broadway Database
- The Guide to Musical Theatre
- Stage Agent
- Broadway Song Index (University of Tennessee)
- Broadway League – official website of Broadway industry
- Performing Arts in America, 1875-1923 (New York Public Library)