 Greater commercial success was enjoyed by Pink Floyd, who also moved away from psychedelia after the departure of Syd Barrett in 1968, with "The Dark Side of the Moon" (1973), seen as a masterpiece of the genre, becoming one of the best-selling albums of all time.There was an emphasis on instrumental virtuosity, with Yes showcasing the skills of both guitarist Steve Howe and keyboard player Rick Wakeman, while Emerson, Lake & Palmer were a supergroup who produced some of the genre's most technically demanding work.Jethro Tull and Genesis both pursued very different, but distinctly English, brands of music.