There probably aren't since basically nobody cares. However, tools do exist to rip the contents of wad files, and I can't imagine the audio formats used would be anything we haven't already figured out (unless it's sequenced). So I think you have a decent shot if you can just find those tools.
Here are the MP3s I have for Everybody Votes. They are 128kbps and have some sound artefacts, so I'm fairly certain this is a line recording rather than Nintendo streams converted to MP3. So, not the best quality, but better than nothing.
I can assure you there will always be interest in Nintendo's musical output!