Pink Floyd was a psychedelic/progressive rock band formed in Cambridge, England, United Kingdom in 1965. Pink Floyd is one of rock's most successful and influential acts, having sold over 300 million albums worldwide. The band's classic lineup was Roger Waters (vocals, bass), David Gilmour (vocals, guitar), Rick Wright (organ, keyboards, vocals) and Nick Mason (drums). Gilmour was brought into the band in 1968 to replace the band's founder, singer, guitarist and songwriter Syd Barrett, who had become increasingly erratic and departed from the band a few months after Gilmour's addition.