(METAL PIONEERS) San Francisco's Blue Cheer catalyzed the sonic Big Bang known as heavy metal with their 1968 debut, Vincebus Eruptum. In the torrid decibel race with the Jimi Hendrix Experience and the Who, Blue Cheer prevailed. Beyond the skull-crushing volumes, Blue Cheer also penned some memorable tunes that brought psychedelic blues and thuggish R&B into the power-tripping equation. Dunno if BC can still bring it, but you'd best believe Mudhoney will be in the house worshipping these influential geezers. (El Corazón, 109 Eastlake Ave E, 381-3094. 9 pm, $15, 21+.)