The album 'Sgt. Pepper's Lonely Hearts Club Band' by The Beatles is widely regarded as the first concept album. Released in 1967, it was groundbreaking in its use of studio techniques, song sequencing, and thematic cohesion. The album is often seen as a response to the counterculture of the 1960s and reflected the experimentation and creativity of the era.

This album influenced countless artists and is frequently cited as one of the greatest albums of all time. Its blend of rock, pop, and avant-garde styles set new standards for what an album could achieve, both musically and thematically. It was also one of the first albums to be recognized as an art form in its own right.