Pink Floyd were founded by students Syd Barrett (guitar, lead vocals), Nick Mason (drums), Roger Waters (bass guitar, vocals), and Richard Wright (keyboards, vocals). Under Barrett's leadership, they released two charting singles and a successful debut album, "The Piper at the Gates of Dawn" (1967). Guitarist and vocalist David Gilmour joined in December 1967; Barrett left in April 1968 due to deteriorating mental health. Waters became the primary lyricist and thematic leader, devising the concepts behind the band's peak of critical and commercial success with the albums "The Dark Side of the Moon" (1973), "Wish You Were Here" (1975), "Animals" (1977), and "The Wall" (1979). The musical film based on "The Wall", "Pink Floyd – The Wall" (1982), won two BAFTA Awards.