George Roger Waters (born 6 September 1943) is an English songwriter, singer, bassist, and composer. In 1965, he co-founded the progressive rock band Pink Floyd with drummer Nick Mason, keyboardist Richard Wright, and guitarist, singer, and songwriter Syd Barrett. Waters initially served as the bassist, but following the departure of Barrett in 1968, he also became their lyricist, co-lead vocalist, and conceptual leader. Pink Floyd achieved international success with the concept albums The Dark Side of the Moon, Wish You Were Here, Animals, and The Wall. By the early 1980s, they had become one of the most critically acclaimed and commercially successful groups in popular music; by 2013, they had sold more than 250 million albums worldwide.