He doesn't do "Easy Listening." You know...Mantovani does Slipknot. There are times I will listen to I guess what is called "heavy metal" on XM, but it's only when I want to marvel at the stamina of the drummers. I don't see how they make it through a single song at that pace, much less a full concert.
Piano tunes from the likes of Joe Sample, Keiko Matsui, Ahmad Jamal, David Foster, Dave Grusin, Errol Garner, Dan Siegal, etc.
That vid is just a "loop" of David Draiman going "oh wah-ah-ah-ah". People put weird things on youtube. Ken introduced me to Draiman's version of The Sound of Silence, which is simply the best I've ever heard. (Apologies to Paul Simon but it is what it is.)