Musi-Cal: Easy access to live music information worldwide: concerts, festivals and other musical events.
OpenMikes.org: User-contributed listings of music open-mike nights in the United States and Canada.
PlanetNightlife.com: Guide to nightclubs, restaurants, casinos and bars. Rate, review and discuss your city's nightlife. Covers Arizona, California, Florida, Nevada, and New York.
Pollstar - The Concert Hotwire: A comprehensive and up-to-date concert venue database. The who's who of concert venue information.