Psychedelic rock may have been invented by hippies in San Francisco, but it was transformed and perfected by the British band that took hallucinogenic multimedia to a comprehensively different level. Founded by Roger Waters, Syd Barrett, Rick Wright and Nick Mason and named for bluesmen Pink Anderson and Floyd Council, Pink Floyd codified high-flying experimental rock in the Barrett era. Welcoming guitarist David Gilmour in 1977, the Floyd changed rock’n’roll forever – again – with albums including Meddle, Animals and Dark Side of the Moon, one of the biggest-selling classics of all time, a record that remained on the Billboard album chart for 741 weeks. They would go on to conquer the world anew with The Wall, and remain the greatest progressive rock band of all time.