John Lennon (in 1980) - "I might've given him a couple of lyrics, but it's his song, his lyric."
Paul McCartney (in 1984) - "A fella who used to hang around the clubs used to say, (Jamaican accent) 'Ob-la-di, ob-la-da, life goes on,' and he got annoyed when I did a song of it, 'cuz he wanted a cut. I said, 'Come on, Jimmy, it's just an expression. If you'd written the song, you could have had a cut.' He also used to say, 'Nothin's too much, just outta sight.' He was just one of those guys who had great expressions, you know."