Not to steer you the wrong way, I love Mozart's Turkish March, but I just am not sure if a legitimate song would make it into the game (as other instrumental taunts don't necessarily follow a specific song, rather an original or song that isn't owned).

It, of course, is up to you, but I would try to personally try to find or create something original, or if not, an old French battle song from the Napoleonic Wars (or whatever the case may be) to better fit the situation of the Spy.

Either way, regardless, I love the taunt! As someone who personally finds interest and plays piano, I would enjoy this greatly!