The Dark Side of the Moon is the eighth album by English rock band Pink Floyd, released on 1 March 1973 by Harvest Records. The album built on ideas explored in earlier recordings and live shows, but lacks the extended instrumental excursions following the departure of founding member and principal contributor, Syd Barrett, in 1968, that characterised their earlier work. Its themes explore conflict, greed, the passage of time, and mental illness, the latter partly inspired by Barrett's deteriorating mental state.
The Dark Side of the Moon was a commercial and critical success. It topped the Billboard Top LPs & Tapes chart for a week and remained in the chart for 741 weeks from 1973 to 1988. With an estimated 45 million copies sold, it is Pink Floyd's most successful album and one of the best-selling worldwide.