Wow..., he was not in my generation (1960's), so I never watched any of his stuff, but I'm stuck inside right now because of this stupid Chinese virus (thanks China), and somehow started watching Donny Osmond videos (and Al Jolson)..., he was incredibly talented...!!
I love Joel Grey and no one comes close to his Emcee in Cabaret. But for George M. Cohan, in my never to be humble opinion it's James Cagney for the win, and second place ain't even rounded the first turn yet. :)