This is one of the best mash-ups I have seen. We need so much more of this.
If you are wondering, that mad piano-playing dancing man is Neil Sedaka singing “Bad Blood”:
The second singer is Teddy Pendergrass singing “Close the door”:
The man in the beginning is Bob McGrath from Sesame Street. Seeing him takes me back to my childhood when I was an avid watcher. :)