Why Paul McCartney and a French Horn Player Almost Fought While Recording 'Revolver'
When you hear about shouting matches during Beatles recording sessions, the usual suspects are John Lennon and Paul McCartney. It makes sense in a lot of ways. John and Paul wrote the bulk of the band’s material and often came into the studio juggling multiple ideas.
So when Paul dragged out the recording of “Ob-La-Di, Ob-La-Da” across five days, you understand why John might snap at him. The same goes for Paul telling his bandmates to stuff it and walking out during the “She Said She Said” sessions. (George Harrison filled in on bass.)
However, you never hear much about John or Paul (or anyone else) clashing with the classical musicians producer George Martin hired to play on Beatles tracks. Though Paul made an odd request during the recording of the strings for “Yesterday,” those sessions went well enough.
Source: cheatsheet.com