Paul Simonon, cofounder of British punk pioneers The Clash, surprised young musicians The Whops as they covered “Guns of Brixton” and “Death or Glory” on a London street corner. In this once-in-a-lifetime encounter, Simonon sings along with the boys as they play two of the most recognizable tracks on The Clash's seminal 1979 album “London Calling.” | Rock & Roll Hall of Fame