The Dark Side of the Moon is the eighth studio album by the English rock band Pink Floyd, released on 1 March 1973 by Harvest Records. Primarily developed during live performances, the band premiered an early version of the record several months before recording began. The record was conceived as an album that focused on the pressures faced by the band during their arduous lifestyle, and dealing with the apparent mental health problems suffered by former band member Syd Barrett, who departed the group in 1968. A concept album, The Dark Side of the Moon explores themes such as conflict, greed, time, death and mental illness. . The sleeve, which depicts a prism spectrum, was designed by Storm Thorgerson in response to keyboardist Richard Wright’s request for a “simple and bold” design, representing the band’s lighting and the album’s themes.