Raz Ben Ari is an Israelian who makes innovative guitar videos on Youtube. His best in my opinition is 10 metal genresin 3 minutes:
He’s also made Evolution of Metal, Metal Around the World and some other clever videos. I’m not sure I like the latest one with movie music themes as much, but I have a good idea for a new video that I’ll send him (he’s asked for new ideas on Twitter).