John Lennon (in 1980) - "That's Paul... with a little help from me, I think."
Paul McCartney (in 1994) - "I could do Little Richard's voice which is a wild, hoarse, screaming thing-- It's like an out-of-body experience. You have to leave your current sensibilities and go about a foot above your head to sing it. A lot of people were fans of Little Richard so I used to sing his stuff, but there came a point when I wanted to do one of my own, so I wrote 'I'm Down'."