He wrote the lyrics for that entire album (Vocalese) and sings on it too -- one of the solos on "Airegin", and a scat solo somewhere else (maybe the Night in Tunisia thing, been a while since I listened).
He also wrote the lyrics for their versions of "Birdland" and "Four Brothers", and maybe four of the tracks on Swing, and probably a bunch of other stuff I'm not thinking of.
He also wrote the lyrics for their versions of "Birdland" and "Four Brothers", and maybe four of the tracks on Swing, and probably a bunch of other stuff I'm not thinking of.