I found this via Mustang Bobby’s Bark Bark Woof Woof blog, A Little Night Music. It is an early TV performance of Victor Borge doing the birthday song in various styles. It is both funny and brilliant.
Watching people like Borge always makes me think of vaudeville and how it helped to develop acts. (Borge didn’t perform in vaudeville per se, but it is the same.) This really allowed (required) people to perfect their acts. In fact, before filming A Night at the Opera, the Marx Brothers went back to vaudeville to perfect the bits in that movie. I wish there was more of this. But at least we have the videos.