Take Joan Jett’s attitude, stir in the vocal prowess of the Gossip’s Beth Ditto and add a dash of Metric’s relentless beats. The result: Girl in a Coma, a trio of irresistible melody makers. Out musicians Phanie Diaz (left) and Jenn Alva (right) and straightie vocalist Nina Diaz (center) hit Beat Kitchen Sunday 12. Rock on, ladies.