It looks like a "wink, wink, nudge, nudge, know what I mean" kind of thing.
I fired up PowerISO, mounted the CUE and the music is all there. Basically, all that's really been done is an extra click or two added instead of everything being all-in-one.
Well... if anybody can try converting all the music to ogg and seeing if the (Windows?) game plays it, that'd be neat. Presumably the file names would be the same, but I've no idea how it works with the expansions; are they still included? If so, how were they organised in the first place (pre-music strip)? I'm not really keen on having to use an image mounter in general, as I don't need one for anything else.
See my post below yours. There are 3 CD images :)