So I just got my hands on the soundtrack to Skies of Arcadia, but according to Wikipedia it's missing these four tracks, for whatever reason:
De Loco’s Theme
Dark Rift music
Blue Moon Crystal tune
Also, I understand that there are two or three tunes which were added in Legends, for the new sidequests that were added. I don't know what they are though.
If anybody could help with these, that would be fantastic, it always bugs me when my collection is incomplete, I feel like I can't nejoy it unless it's fully comprehensive. I did a search of the forums but all I found were other requests and broken links.