 Making noises, he's singing very spontaneously, and that's it. That's what you hear on that song. That's Paul McCartney. He's not playing a kazoo, but a very good collection of people on the song, including having the great Harry Nilsson singing backing vocals, a pretty cool factor as well. Ringo continued to prove, of course, that he was quite the performer. In fact, Ringo's the greatest.