“Restraint” isn’t a word often used when describing heavy metal, which is probably why fans of Baroness are having such a difficult time putting their finger on what it is about the band’s debut full-length that is so different. The Savannah, Ga.–based quartet—which, after two well-received EPs and a split with the Unpersons, landed a deal with Relapse Records—released Red Album in September to mixed reviews. Missing, to a certain degree, is the sheer brutality and all-around evilness that marked previous recordings; in their place, upbeat riffs, dance beats, and unexpected vocal melodies. But if Baroness has lost some of its thunder for the sake of musical maturity, it’s lost none of its relentlessness: The band, which is constantly on tour, has played close to 250 shows a year since its inception in 2003. Baroness performs with Time Of Cholera and Salome at 9 p.m. at DC9, 1940 9th St. NW. $10. (202) 483-5000.