Forest Whitaker and Barry White
I always thought that Forest Whitaker could portray sing Barry White. Maybe he's getting old now, but he still has time to do it. Michael Douglas portrayed Liberace very well and they used make-up to make Douglas look far younger than he looks in real life.
Barry White had a signature facial structure, so to match an actor that looks like that will be hard. Maybe an unknown?
For God's sake, please don't cast Will Smith as Barry White! Sometimes these Hollywood nuts think it won't matter to the public if the person looks like the one their playing.
And I hope they don't cast the actor Leon, to play White. He did excellent as David Ruffin and Little Richard, but horrible as Jackie Wilson!