On Dec. 14, 1979, British band the Clash released their seminal third album, London Calling, breaking through to Americans with their socially conscious lyrics and experimental mix of punk, reggae, ska, and rockabilly. Years later the album, featuring such hits as the title track and "Train in Vain," was ranked No. 8 on Rolling Stone's list of the 500 Greatest Albums of All Time. To celebrate the 30th anniversary of London Calling, take a look at photos from the Clash's heyday. Pictured, from left to right: bassist Paul Simonon, singer Joe Strummer, drummer Topper Headon, and guitarist Mick Jones.