Pink Floyd was a groundbreaking British rock band formed in London in 1965, known for its innovative music and elaborate live shows. The group originally consisted of Syd Barrett, Roger Waters, Nick Mason, and Richard Wright, with David Gilmour joining later. They are celebrated for their concept albums, most notably The Dark Side of the Moon, Wish You Were Here, and The Wall, which explore themes of alienation, mental illness, and existentialism. Their experimental sound, blending rock with psychedelia and progressive elements, along with striking visuals, made them one of the most influential bands in music history.