What is it exactly? I just find out about it (not that I'm gonna participate or something) and from what I saw it's some kind of singing contest. Could someone give it more details? Maybe a Wiki page be also appropiate?
And yes, I think that might be possible with at least some tracks.
There are three The Little Mermaid songs used in KHII now that I think of it...
I'm currently hoping to fill some music articles with Kingdom Hearts information whenever it's possible, like here: Bibbidi-Bobbidi-Boo, but I have problems as I'm not that good with tracks's titles in Disney and Kingdom Hearts media, so if anyone could lend me a hand, either by just giving a plain list (or at least a song or two), or do it themselves I'll be happy. You can see track list for all KH games here: http://www.khwiki.net/List_of_Kingdom_Hearts_series_tracks