I don't know if it helps but the artist in AO is Ellen Meijers. In AE it is Ellen Meijers-Gabriel. I have the songs but I can't remember where I downloaded them from.
I do remember that I found the page in a thread in these forums..
too bad I can't help..
EDIT:
Found the link from an old thread!
http://oddworldlibrary.net/archives/oddtunes/
The Soundtracks of AO, AE and MO are in there
