Martin and Lewis
I like this clip of Dean Martin and Jerry Lewis performing a song on the Colgate Comedy Hour (this had to have been in the early 1950s). What's funny is that Dean keeps cracking up every time Jerry hits some of his signature high notes (at about 30 seconds and at about 2:05). Also, notice that they begin the song in the wrong key, and both Dean and Jerry keep craning their necks towards the band during the first 25 or 30 seconds of the song until they get on track (Jerry also cracks, "Want to go over to the band?").