ATLANTA—Patrons of Valentine's Tavern were visibly crestfallen Tuesday when their pleasant evening of drinking and conversing with friends was suddenly derailed by the sight of a few people plugging in instruments. "Ah, Christ," bar-goer Nick Manikat said as a stand-up bass was rolled onto the stage. "They have live music here?" According to patrons who had just ordered a round and did not have time to finish their drinks before the band's set began, they were going to be stuck there for at least 15 or 20 fucking minutes.