Sgt. Pepper's Lonely Hearts Club Band
The Beatles
Before Sgt. Pepper's, no one seriously thought of rock music as actual art. That all changed in 1967, though, when John, Paul, George and Ringo (with "A Little Help" from their friend, producer George Martin) created an undeniable work of art which remains, after 3-plus decades, one of the most influential albums of all time.