Jazz fans in Dallas are grown folks. They have a certain refined taste in art and music that can't be found in many local music clubs. Also, they go to bed at a reasonable time on weeknights. Sandaga 813 understands this, which is why the eclectic space in Exposition Park has the feel of a low-lit urban art gallery. And when you get there at 8 p.m. on a Tuesday, you can expect Shelley Carrol and his impressive band have already had their first downbeat. Careful, though. The music and the atmosphere are so good that you're likely to stay up way past your bedtime.