Yeah, it's in an asset bundle.
Thanks. I haven't been following the blog or kickstarter updates, so I wouldn't have seen that otherwise.
I found the right asset bundle, and according to the manifest all but one of the tracks are from SBR. I guess it's just the main theme I need. :-)
Chris, would you object if I found (or wrote, although I suspect that would be more effort than I have time for) an extractor and liberated the music?