Glottal Opera

Personally, I would have gone with "Deep Throat Opera," but I don't think that would have made it past most firewalls...

http://www.youtube.com/watch?v=xa1K_ia21NA

Found this one through John Well's phonetic blog, (which is one of the best linguistics blogs around), it's a short film of four singers who are getting, shall we say, an extreme close up on their voice boxes.  I certainly found it interesting, not to mention wonderfully disturbing.  Also, as a linguist, I always wanted to take voice lessons, just because it seems like a totally different perspective.