since im too lazy to make a whole list of songs im just going to say that one of them would have to be the overworld song when Celes first starts to look for the rest of the party.
I think the first track in the FFX Piano collections disc rocks. Add that as #17 for my list. 
I need more then 15. I would also put the castle dungeon music from .hack. That music is so eerie. The music from the white forest in Legend of Mana is good too.
Whoah! Seymour Omnis boss in FFX music roxors!
Also from .hack I like the Hypha stage field music.