We get a lot of those "Luna shouting to metal" PMV's. Usually they end up joining the armada sad Luna fanfics in her abandoned moonbase, but the first one in this list does some of the best syncing I've seen from the "Luna shouting to metal" genre.
Actually, all of these do some pretty neat syncing tricks, but I can't think of anything else to type, so go watch them all!
1.) MLP FiM - Lunar Exploder - THANKS FOR 100 SUBSCRIBERS PMV
2.) [PMV] Looks Like I Got Me a Friend
3.) [PMV] Can I Play With Maredness?