Even if Kurt Cobain hadn’t sung a note, he’d have improved the world by introducing to the larger public the work of underground geniuses: Daniel Johnston, the Wipers, Scratch Acid, the Raincoats, the Butthole Surfers, the Vaselines, the Melvins and many, many others. Among those who benefited from Cobain’s imprimatur is the Meat Puppets, from Arizona, who joined Nirvana onstage for their MTV Unplugged performance and whose album Meat Puppets II will sell eternally to those seeking out the Cobain family tree. They play on Thursday, Nov. 14, at Sweetwater Music Hall. 8pm. $17-$22. 415.388.3850.