I've seen this guy here and there on the web. As far as I can divine, He's Alexander Hrustevich (Александр Хрустевич ), and he's from the Ukraine.
I'm no expert, as I can't play any musical instrument, and my singing is best kept in the bathroom, where at least I am appreciative, but looking around the interwebnet, the real musicians out there, the classically trained folk, the orchestral folk, and the soloists, there seems to be a consensus that what this lad is doing is exceptionally talented.
When I lived in Finland, I worked with a guy who had studied the piano-accordion, in Moscow, he was pretty good, but nowhere near this.
Don't let the tacky background fool you, this is not a schoolkid type performance.
If you want to hear more, youtube has quite a few other pieces.
