Poll: Actors Who Sang in Their Oscar Winning Roles

This is a list of actors* who won an Academy Award for a role** that also involved singing. Who do you feel performed the best mix of acting and singing? *whose main credit on IMDb is acting. Singers who also act are not included (e.g. Jennifer Hudson, Barbra Streisand, Bing Crosby) **in a musical, musical biography or music film Discuss here