Bourne Vivaldi (Bourne Soundtrack/Vivaldi Double Cello Concerto) - ThePi...

This is one of the coolest, in my opinion duo covers I've seen before (which is not a billion, but...)

These as you can tell are the PianoGuys which you can check out on youtube or their site at...
http://thepianoguys.com/newstore/

Love ya, 

ELIZA