heres an intersting one, but its probably been done quite a few times
20th century minimalis music compared to 12th centurty notre dame polyphony. like perotin ad leonin (or only those two guys) steve reich has said that he was influenced by them.
http://www.youtube.com/watch?v=gtkmn...eature=related
http://www.youtube.com/watch?v=xJ_W1...eature=related
http://www.youtube.com/watch?v=SaSdm...eature=related