Ikey Owens, keyboard maestro for Pocket Lent, Free Moral Agents, Long Beach Dub All-Stars, Slightly Stoopid, the Mars Volta & (most recently) Jack White.
I was lucky enough to see him perform with Pocket Lent in '97 as well as with Slightly Stoopid during his one tour with them (as one of maybe 15 people in the audience), and then in the aughts saw him a few times with the Mars Volta and his own band Free Moral Agents. He was an essential element of the California music scene since Pocket Lent's astonishing Verve showed the punkers what music is supposed to sound like.