Bob Dylan (born Robert Allen Zimmerman May 24, 1941, Duluth, Minnesota, USA) is widely regarded as America's greatest living popular singer/songwriter. He has been an influential figure in popular music and culture for five decades. Dylan is credited with expanding the vocabulary of popular music, moving it beyond traditional boy-and-girl themes into the heady realms of politics/social commentary, philosophy, and a kind of stream-of-consciousness absurdist humour that defies easy description. His most famous songs include "Blowin' in the Wind", "The Times They Are A-Changin" or "Mr. Tambourine Man".