16. Belly Up in Aspen, Colo.
An oasis in a ski-town concert scene that usually focuses on local singer-songwriters and itinerant jam bands, Belly Up Aspen opened in 2005 and has drawn surprisingly major headliners from Jane's Addiction to Tiesto to Pitbull to B.B. King. Although the biggest shows are often sold out at the 450-capacity club and drinks are pricey, that's usually not a problem for the ritzy Aspen crowd. Owner Michael Goldberg "introduced music to Aspen that probably never would have played there," says Brian Ahern, a top William Morris booking agent.
Fun Fact: Legendary Rolling Stone writer Hunter S. Thompson didn't fancy the name of his friend Michael Goldberg's club. He thought it should be called "The Orifice."