When the Clash hit the scene in 1977 it seemed like their mission was to destroy giant arena rock acts like Bruce Springsteen. But it turned out that Clash frontman Joe Strummer was a huge Springsteen fan. "Bruce is great," Strummer wrote in a 1995 fax to Mojo. "If you don't agree you're a pretentious martian from Venus. His music is great on a dark, rainy morning in England, just when you need some spirit and some proof that the big wide world exists." The admiration worked both ways, and when Strummer died in 2002 Springsteen was more than happy to honor him furing the Grammy telecast with a killer performance of "London Calling" alongside Elvis Costello, Dave Grohl and Steve Van Zandt.