1. The Broadway Musical Home: http://broadwaymusicalhome.com/index.html cast & creative credits, from all versions, song lists & previews, videos, links to official show website
2. Internet Broadway Database: http://www.ibdb.com/ cast & creative credits, awards, song list, opening date, setting, links to official show website with plot synopsis
If you click on songs, an itunes button might allow you to listen to a song preview
3. Playbill vault: http://www.playbillvault.com/ searchable database with plot synopsis, cast & creative, and dates of various versions
4. Broadway.com- for currently running shows: http://www.broadway.com/ click on SHOWS then Broadway for overview of show, story, cast, photos, videos (including some clips from show), reviews
5. Allmusicals.com: http://www.allmusicals.com/index.htm lists of songs for each show- click on songs for complete lyrics
6. MTI Musical Theater International: http://www.mtishows.com/ detailed plot synopsis for many shows (Aida, Annie, Fiddler on the Roof, Hairspray, Les Mis, Miss Saigon, Music Man, Wedding Singer, West Side Story)
7. ST Lyrics: Movie, TV, and Theater sound tracks- contains song lists, lyrics, and free streaming (with download) for nearly all musicals http://www.stlyrics.com/index.htm
8. The Musical Lyrics: http://www.themusicallyrics.com/ song lists and lyrics for many shows (Annie, Cabaret, Jesus Christ Superstar, Les Miserables, Lion King, Mary Poppins, Music Man, Newsies, Nice Work, Porgy & Bess, West Side Story, Wicked)
9. Tams-Witmark Musical Library: http://www.tams-witmark.com/musical.html creative credits, synopsis, awards, list of instruments used (Anything Goes, Bye Bye Birdie, Cabaret, Kiss Me, Kate, Porgy & Bess, Scarlet Pimpernel)