A song I can play on an instrument? Haha! That's a joke!
I don't even play Guitar Hero.
I think the only instrument I might be able to play, is the triangle. And then I imagine the only thing I could play with the triangle is Jingle Bells. Or I could gallop around making the sound of the horses's hooves.
If none of those two options worked out, I could just shake a couple of bells around, I'm sure.