Originally posted by Thomas
Well, I mean the WAV files to use in a midi editor.
EDIT: Nevermind, I found a WAV rip of each sample: Link
I'm not too sure about a WAV format of the samples, but you could always check out these soundfonts: Link
There's more than just SMW, but use whatever you need to there.
... but that wouldn't really help with porting music to SMW unless you want to hear how it would sound like prior to actually starting to port it.