The Beatles - i'll be back, 1964

‘I’ll Be Back’ was co-written but it was largely John’s idea. When we knew we were writing for something like an album he would write a few in his spare moments, like this batch here. He’d bring them in, we’d check ’em. I’d write a couple and we’d throw ’em at each other, and then there would be a couple that were more co-written. But you just had a certain amount of time. You knew when the recording date was and so a week or two before then we’d get into it."