Eric Clapton - played lead guitar on "While My Guitar Gently Weeps"
Mal Evans - played hammond organ on "You Wont See Me", Bass Drum pounder on "Yellow Submarine", the anvil player on "Maxwells Silver Hammer" and the alarm clocks on "A Day in the Life"
Nicky Hopkins - played the electric organ solo on "Revolution"
Brian Jones - played the Saxophone on "You Know My Name (Look Up the Number)"
Jackie Lomax - provided backing vocals on "Dear Prudence"
Jeff Lynne - played guitar on "Free as a Bird" and "Real Love"
Pattie Boyde, Linda McCartney and Yoko Ono - provided backing vocals on "Birthday
would be interesting to see some of them in TBRB
but alas the games already completed and theres no chance of it haha