Hailed--and obsessively followed--by groups of passionate fans, ignored or derided by mainstream audiences, here are the musicians who, through their bizarre idiosyncrasies or their unique musical styles, have carved their own special niches in the rock pantheon. More than 200 profiles spotlight the Grateful Dead, Dead Kennedys, Phish, John Hiatt, Sonic Youth, Big Star, Blue Oyster Cult, and more. 75 photos.