Considered one of the UK's first psychedelic music groups, Pink Floyd began their career at the vanguard of London's underground music scene, appearing at UFO Club and Middle Earth (club). According to "Rolling Stone": "By 1967, they had developed an unmistakably psychedelic sound, performing long, loud suitelike compositions that touched on hard rock, blues, country, folk, and electronic music." Released in 1968, the song "Careful with That Axe, Eugene" helped galvanise their reputation as an art rock group. Other genres attributed to the band are space rock, experimental rock, acid rock, proto-prog, experimental pop (while under Barrett), psychedelic pop, and psychedelic rock. O'Neill Surber comments on the music of Pink Floyd: