Listen, I'm gonna spoil the twist of this video: the dude is playing Mario Kart 64 (Luigi Raceway, specifically) and the music sounds unusually great. Like, wayyyy better than you remember. The reason? There's an actual band playing the game music live (and in-sync with the game) right behind him.
Still, it's great and wonderful. The next time you sit down for some Mario Kart, we would recommend you have a live band enhancing the music the whole time, seems like a fun idea.
Here's the full soundtrack to Luigi Raceway, in case you wanted to have some kind of Pavlovian response that makes your fingers tingle and start trying to prepare to powerslide nonstop.