I wouldn't want to be there when the wind blows... I keep picturing a massive jug band that you can't escape.

I hate to be Mr. Curmudgeon McFarkelson, because the kid is good at what he does, but why do we get blown away when we hear music like this played out of context? What I mean is this: if this video were of a high school orchestra playing the piece (and this piece is very playable by a good high school group, as is the Tchaik 4 in his other video), we wouldn't be moved to cries of "incredible" and "No Way!" After all, we expect as much. However, when we hear an accordion (or theramin, or crystal glasses on a bridge, or a jug band) play music with ANY requisite level of technique and musicianship, we are blown away. We short change our souls by being blown away by Vivaldi on an accordion but not giving the music a second glance when we see it in the expected venue.

And if I haven't already ostracized myself, the very simple fact is that the time needed to achieve artistic proficiency on violin (or viola, cello, etc...) is far greater than is needed for the accordion. If this kid had spent as much time on violin as he has spent on accordion, he would be very run-of-the-mill indeed.