It was 50 years ago today that The Beatles were in the studio working on the follow-up to their 1966 album, Revolver, and on June 1, 1967, they released Sgt. Pepper's Lonely Hearts Club Band.
Sgt. Pepper's has been called the beginning of the album era. In 2003, Rolling Stone ranked it #1 on their "500 Greatest Albums of All Time." It is the best-selling album of the 1960s.