It may not be worth renting the video, but one time I was watching "
St Louis Blues" on cable several years ago. It was made in 1958, starring Nat King Cole as WC Handy. It's populated by the best of the black musicians of the day -- Cab Calloway, Ella Fitzgerald, Pearl Baily, Eartha Kitt, Mahalia Jackson, Ruby Dee ...
Anyway, the thing that really caught my eye was seeing Billy Preston in the opening credits, so I was watching for him. He appeared in a scene of WC Handy as a boy, absolutely ripping on an old upright piano. Preston was 11 or 12 at the time, and it was unmistakably him with that large head and gap-tooth smile.
I have the Harrison Concert for Bangladesh DVD set with Billy on it, but don't have the Concert for George. I'll have to look for that one.
I still consider his electric piano solo on "Get Back" as one of the coolest ever in pop music.