Would anyone have any suggestions as to where I can find piano music that is either depressing or very powerful? A possible reference would be a song titled "Ai To Hi" from the anime series Haibane Renmei. Any help is appreciated.

Accidentially found this on the web. Maybe what you are looking for...

http://www.pianomusiclovers.com/bridgeoftime.htm

mp3 Samples available at :

http://www.cafepress.com/pianolovers