The Dark Side of the Moon - Pink Floyd

The Dark Side of the Moon is the eighth studio album by English progressive rock band Pink Floyd, released in March 1973. It built on ideas explored in the band's earlier recordings and live shows, but lacks the extended instrumental excursions that characterised their work following the departure in 1968 of founding member, principal composer and lyricist, Syd Barrett. The Dark Side of the Moon's themes include conflict, greed, the passage of time and mental illness, the latter partly inspired by Barrett's deteriorating mental state.
The album was developed as part of a forthcoming tour of live performances, and was premiered several months before studio recording began. The new material was further refined during the tour and was recorded in two sessions in 1972 and 1973 at Abbey Road Studios in London. The group used some of the most advanced recording techniques of the time, including multitrack recording and tape loops. Analogue synthesisers were given prominence in several tracks, and a series of recorded interviews with staff and band personnel provided the source material for a range of philosophical quotations used throughout. Engineer Alan Parsons was directly responsible for some of the most notable sonic aspects of the album, including the non-lexical performance of Clare Torry. The album's iconic sleeve features a prism that represents the band's stage lighting, the record's lyrics, and the request for a "simple and bold" design. Wikipedia