now this is just a thought, seeing we already have donkey kong country 1, 2, 3 as albums, why not create a final album from the pre nintendo Wii era? I personally loved Donkey kong 64 and spent hours playing it, and it had a lot of challenges and awesome themes, and I think artists could run wild with their imagination as to what themes they could use.
like for an example, the Angry aztec area, could be given an egyptian style of remix think like arabian music: Lebanese Style music or something along those lines
for the jungle themed areas do something different, maybe a pop / rock style
Frantic factory maybe a techno / electronica style
Gloomy Galleon, Crystal Caverns and creepy castle give them halloween styled remixes, not all of them are gloomy, so maybe the brighter ones the artists can feel free to use their imagination with those
as for Fungi forest the day can be bright and cheerful style mixes, and the night time can be mysterious / spooky remixes, as for the rest, I'd say that is up to the artists, anyway this is just my thoughts, please comment, or even add ideas in. http://nintendo.wikia.com/wiki/Donkey_Kong_64_Soundtrack