Imagine being in a band as close-knit as The Beatles were between 1962-68. Over that hectic period in the band’s life, the Fab Four went from constant recording and touring to worldwide fame of a kind few musicians ever knew. So they had to stick together whether they wanted to or not.
When John Lennon brought Yoko Ono into the picture, the dynamic changed completely. Looking back years later, the others understood that John was in love and was following his heart. But when Yoko arrived for the first time during the White Album sessions, she upset a delicate balance.
For starters, The Beatles had a rule that wives and girlfriends didn’t hang around during recording sessions. “Their ranks had always been so closed,” engineer Geoff Emerick wrote in Here, There and Everywhere. “It was unthinkable that an outsider could penetrate their inner circle so quickly and so thoroughly.”
Source: cheatsheet.com