John Lennon

"Black music started the revolution in the world, the so-called youth revolution," John Lennon argued.

Without it, the group might never have rebounded from crushing disappointment to complete 'Abbey Road.'

The '90s-era 'Anthology' sessions weren't the first time they recorded without him. More like the 20th.

Guitarist and actor have been working together a few years and chose song because of its timeliness.

Others subbed for him as far back as 1964's "You Can't Do That."

The rocker dismissed the song almost immediately.

Each of the Fab Four was capable of taking the spotlight.

Drummer recalls conversation with former Beatle about food at Rod Stewart concert.

“Security secrets” hidden since the ‘70s were unveiled after author spent two decades battling for their release.

Broken shades were left in Ringo Starr’s car in 1968.

Petty had been hoping to meet the former Beatle before he received the devastating news of Lennon's murder.

They've both endured tremendous losses.