"Sell out!!" I laughed when I saw the angry graffiti scrawled on MURS' tour bus in the Record Bar's parking lot Saturday night. I recalled the first time I felt betrayed by a musician. The Clash shocked me by concluding London Calling with a pop song. The very concept of "selling out" now seems quaint. Why wouldn't a rapper allow Microsoft to provide a handsome tour bus? The anonymous fan's rage depicted here is actually kind of sweet.