I've been on a pretty big Sammy Davis, Jr. kick lately, you guys. Not only is he a very talented singer, but he's sort of a consummate entertainer in a way that Frank never was (Dean came close). He came up a hoofer, and his performances tended to blend song, dance, and comedy. He really should have starred in a sitcom, or something -- his film roles really underused his talents (for example, see Ocean's 11 -- no, don't). Anyway, here's him singing "One for My Baby...," a standard, and by his account, to be sung by someone performing after him in the same show (Dean, I think EDIT: Whisk E. Bear reminds me that it was almost definitely Frank coming on; he's almost definitely right). The idea of just singing the song straight must not have appealed to him, so he does impressions of different celebrities singing various verses. It's a hoot, it really is.