Have you ever heard of ThePianoGuys? Or, Jon Schmidt and his cello-playing-Steve-friend? Well if you haven't heard of them, it's a good thing you're here. They are pretty darn cool, play really awesome music, and make me wish I were a much better musician. And all it takes is a grand piano and a cello. Or 8 cellos and no piano. Or 4 cellos, 2 pianos, and a drum machine.
I watch this video all the time and I think you should too. Enjoy!