The Beatles' Apple Records signed one of its first artists in 1968 after supermodel Twiggy discovered Mary Hopkin on TV.

Paul McCartney remembered an old Nat King Cole song. That inspired him to write The Beatles' classic "Mother Nature's Son".

A friend of the Beatles said Paul McCartney was nicer than John Lennon. Still, people somehow trusted him less.

John Lennon did his fair share of straining in The Beatles, but he came close to losing his voice altogether when working on his solo ventures.