Denver's oldest jazz and blues club offers an impressive roster of talent throughout the week, and it never charges a cover. The dimly lit bar at the corner of 20th and Market streets might not look like an integral part of Denver's nightlife from the outside, but El Chapultepec's free music and dancing make for one of the best nights out in the city. Catch weekly regulars such as the Diana Castro Band and the Freddy Rodriguez Quartet, or spend a weekend with Eef & the Blues Express. Either way, you won't leave disappointed.