If we could hear from Michael Land that would be great, we've heard from just about everyone else on the game so far on these forums

Again it would depend on what the contract says, I would assume that Land has at least Joint Owner ship of the music as he's worked on the soundtrack for every game so far and that's a bit of a back catalog to NOT have any rights over.
I would assume Lucasarts would hold the rights to some extent but as SMI:SE has shown, Land had no part at all with the re-mastering of the tracks. So maybe a soundtrack would be possible but themes used in past games (Main theme, Underwater, Chapter Screen, etc) might be owned by LucasArts whilst it could be possible that any new scores could be part owned by Telltale.