Add Yahoo as a preferred source to see more of our stories on Google. It was a period of constant experimentation, both musically and chemically. As Paul McCartney later told Howard Stern, "Things ...

Paul McCartney and John Lennon took LSD while recording the album, 'Sgt. Pepper.' On March 21 of that year, Lennon, then 26, accidentally took acid during a recording session at Abbey Road. Leslie ...