ya i would use something heavy too. Something like a Linkin park song; a song that starts mellow then builds up to a strong peak. It's really easy to make a music video with this type of music, and also make it very emotional too. Or a smooth piano solo that builds up, kinda like the ending movie for this anime show I watched.....Kilkider or something. It was about a robot trying to be human. After watching the episode, I was displeased, but after watching the ending video.....I want to watch it again now.