On June 3rd 1964 Ringo Starr collapsed at a London photo shoot, from tonsillitis and pharyngitis.
Starr was brought to University College Hospital where he was given strict orders to rest up and take it easy. The timing could not have been worse as The Beatles were due to commence their world tour the following day.
It was much too late to cancel so Brian Epstein and George Martin had to look into temporarily replacing Ringo for the tour. This didn't go down well with John, Paul or George as the four were loyal and tight together as a unit.
Martin eventually convinced the band that it was necessary and of course, temporary. At Martin's request session drummer Jimmie Nicol was called and asked to rehearse a few songs with the Beatles in Ringo's stead.
Ringo rejoined the band on June 14th in Australia.
"I was having a bit of a lie down after lunch when the phone rang. It was EMI asking if I could come down to the studio to rehearse with The Beatles. Two hours after I got there I was told to pack my bags for Denmark." - Jimmie Nicol