Deep Purple is an influential English rock band formed in Hertford in 1968. Known for their distinctive blend of hard rock and progressive elements, the band's sound was defined by Jon Lord's organ work and Ritchie Blackmore's guitar riffs, along with Ian Gillan's powerful vocals. Deep Purple is widely recognized for their seminal album "Machine Head", featuring the iconic track "Smoke on the Water". Their significant influence on the development of heavy metal music has earned them a place in the Rock and Roll Hall of Fame.