Pink Floyd are an English rock band who initially earned recognition for their psychedelic or space rock music, and, as they evolved, for their progressive rock music. They are known for philosophical lyrics, sonic experimentation, innovative cover art, and elaborate live shows.
Pink Floyd had moderate mainstream success and were one of the most popular bands in the London underground music scene in the late 1960s as a psychedelic band led by Syd Barrett; however, Barrett's erratic behaviour eventually forced his colleagues to replace him with guitarist and singer David Gilmour. After Barrett's departure, singer and bass player Roger Waters gradually became the dominant and driving force in the group by the late-1970s, until his eventual departure from the group in 1985.
The band recorded several albums, achieving worldwide success with The Dark Side of the Moon (1973), Wish You Were Here (1975), Animals (1977), and The Wall (1979). Although they were unsuccessfully sued by Waters for rights to the name, they again enjoyed worldwide success with A Momentary Lapse of Reason (1987) and The Division Bell (1994).