No. 18 Sgt. Pepper’s Lonely Hearts Club Band by The Beatles (1967)
The Fabs’ most important record, this whimsically psychedelic opus was a watershed moment in popular music. Kick-starting rock’s love affair with concept albums and providing the unofficial soundtrack for the “Summer of Love,” Sgt. Pepper proved that rock music has grown up artistically and set the stage for groundbreaking LPs in the coming years from acts like Pink Floyd and Queen.