Songfacts®:

• McCartney recalled recording this song to the Mail on Sunday May 12, 2008: "I'd already recorded most of the song, and when the time came to put the bass on it I played a fairly straightforward track. Then I was messing around, because I thought it was done, so just for my own pleasure I started goofing around, playing way too much, and afterwards I joked with the producer, saying, 'Whoa - that was way over the top! He said, 'No, that's great - do another take like that. I think that's exactly what the song needs.' That was dangerous, because I pulled out every trick in the book and just had fun playing. But when I listened back it all seemed to make sense. I was going where I wouldn't normally go, throwing in notes that I didn't think were needed, but somehow it fitted. I think I only did two takes."