"When we came, it was quite shortly after Kennedy being assassinated," Paul McCartney says in the trailer, released Thursday. "Maybe America needed something like The Beatles to be lifted out of sorrow." McCartney and Ringo Starr are among the documentary's producers, while David Tedeschi serves as director.

While nothing is confirmed, rumors of Gladiator II star Paul Mescal playing Paul McCartney in the upcoming Beatles biopics from Sam Mendes have surfaced. During an interview with Mescal about Gladiator II, I asked him what he would ask McCartney if he met him in preparation for playing him in the biopics.

All that changed when the band made Sgt. Pepper's Lonely Hearts Club Band. Find out why the creation of that album was so freeing, below.