Wow, that's hard

I have so many favorites! I'd have to say my all-time favorite (and it's held that place for a while now) is Ghost Love Score, by Nightwish

Others are...
Being Everyone - After Forever
Wunderkind - Alanis Morissette
The Phantom of the Opera - Andrew Lloyd Webber
It's My Life - Bon Jovi
Will You Still Love Me? - Chicago
Isobel - Dido
Storms in Africa - Enya
Book of Days - Enya
The Last Crusade - Epica
Another Me - Epica
Sensorium - Epica
Going Under - Evanescence
Anywhere - Evanescence
Come What May - Moulin Rouge soundtrack
Si Volvieras a Mi - Josh Groban
My Confession - Josh Groban
The Haunting - Kamelot
Abandoned - Kamelot
Falling Again - Lacuna Coil
Enjoy the Silence - Lacuna Coil
Hand Me Down - Matchbox Twenty
Through with You - Maroon 5
End of All Hope - Nightwish
Dead to the World - Nightwish
Ever Dream - Nightwish
Nemo - Nightwish
Over the Hills and Far Away - Nightwish
Bare Grace Misery - Nightwish
Angel - Sarah McLachlan
The Boxer - Simon & Garfunkel
My Little Town - Simon & Garfunkel
Out in the Real World - Stream of Passion
Strange - Tori Amos
Overcome - Within Temptation
See Who I Am - Within Temptation
Jillian (I'd Give My Heart) - Within Temptation
Angels - Within Temptation
Now & Forever - Xandria
In Love with the Darkness - Xandria
Alphabetical order, even!

Ok, so that's a lot of favorites...and it's not even all of them, but ah well...