Well, if you convert the Wii musics to PCM16, there's no reason a DS couldn't play them since technically it supports PCM16 sound (among others).

Now, storage space has to be taken into account. For example, SMG's musics are uncompressed PCM16 with atleast two tracks, and they're huge. This isn't a problem with a 4.7GB DVD, but with something like a DS cart, they usually want to use the smallest chip size possible, so they'll compress everything.

NSMBWii's musics are, iirc, compressed into an ADPCM-like format that the Wii's DSP can decode natively. Perhaps this format can be converted to the ADPCM format the DS supports, but once again, storage space has to be taken into account. And such a modification would require important code changes-- NSMBDS's musics use ADPCM, but it is mostly instruments, and the music files are similar to MIDIs. To get NSMBDS to play full (non-MIDIfied) versions of NSMBWii's musics, you'd need to change the sound code to directly stream the ADPCM sound from the cart (those music files would most likely be too large to fit in the RAM), unless the SDAT format can do that somehow...


In short, yes, it can be done. However it's not going to be easy.
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