Nancy Shevell

Chrissy Hine from The Pretenders also does background vocals on that song.

His wife, Paul's new wife, Nancy McCartney, actually does spoken word on a song called Mountaintop.

And then to keep it into the family.

George Martin's son, Giles Martin, who also did remastering of the later Sergeant Pepper reissue and stuff, co-arrangement on three tunes.