Bing Crosby

He won an Oscar for playing a kindly priest in Going My Way, but he is best known as one of Hollywood's greatest crooners, whose recording of "White Christmas" is the largest selling Christmas song ever. He was also pretty limber on his feet, which can be evidenced in "The Minstrel Song" from White Christmas which is posted here, along with a clip from his other Oscar-nominated performance in The Country Girl: