Two peas in a pod-duh! (Laurel and Hardy) Sons of the Desert are we! And they could sing too!
http://www.youtube.com/watch?v=72qZZapTHFo
Carol Burnett gang with Tim Conway
Jonathan Winters
Weird Al.
http://www.youtube.com/watch?v=fqz1ojIQTBk
John Belushi and any of his samurai skits.
Monty Python doing anything.
http://www.youtube.com/watch?v=4k2L7oNMDe0
Steve Martin back when he wore an arrow through his head.
... and played the banjo.