Wasn't this the video that had a bunch of different folks auditioning to be the vocalist? Donny Osmond appears uncredited, and when asked if he has any experience he replies, "I used to sing with my brothers a little."
ETA: checked the AMG credits for this album (Flash) to see who did the vocals, and no one of note is credited except Rod Stewart, and he was only on "People Get Ready".
However Jan Hammer was credited on keyboards, and now he's tune #10. Also interesting that this song was written by Nile Rodgers.