The Clash was one of the first and most important British punk bands. In the 1970s, they were the Beatles to the Sex Pistols' Stones and went on to incorporate elements from all the roots music they loved -- reggae, rockabilly, soul, blues -- without ever straying too far from their punk roots and their political commitment. Their landmark 1979 double album, London Calling, stands as one of rock music's finest and most ambitious achievements. Mick Jones, Paul Simonon, and Joe Strummer all went on to other projects after the Clash (Big Audio Dynamite, Havana 3 AM, Strummer's so...