Agreed, there have been a lot of videos like this one before. It's a pretty common trick shot but there are two things that set it apart. 1) The kid is only like 10, so for a kid his age, that's pretty solid. 2) He did it during the intermission of an NHL game, which is a lot of pressure for a kid and a big stage to be on.
That's true, except for the fact that Red Octane were the principals building on a music framework developed by Harmonix. So, Red Octane, and now Activision, have the rights to Guitar Hero, not Harmonix.
I don't even like Boston, but even I know that Tessie (if not the Dropkick version) has been a tradition longer than anything the Cubs can come up with. Even so, that wasn't even Tessie! It was "I'm Shipping Up To Boston", another great song.