Very nice tune!

Thank you for uploading the uncompress .wav. :)

Is there any way you could change the license on this one to CC-BY 4.0 like your other music? This one's my favorite, but the SA means I can't really use it for a commercial game. Sorry if you did this on purpose because you didn't want to give everything away.

Wabunga, is there a specific reason you can't use CC BY-SA licensed material in your commercial game? CC BY-SA allows for commercial use within the bounds of its legal agreement. I don't know all of the details & restrictions, but I believe as long as you give proper attribution & aren't using it with DRM encumbered software you can use it. I believe all of the licenses used on OGA allow for commercial use.

AntumDeluge is correct: cc by sa is perfectly compatible with commercial projects. As long as you release any derivatives of the asset under CC BY SA and credit the original artist, you're fine. Game code, story content, etc. (Anything not directly derived from the asset in question) doesn't need to be released under CC BY SA.

Remember, Game projects can have different licenses for different parts. 

Do Steam and Unity count as "DRM encumbered software?" The way I read it was "the entire game needs to be licensed under 4.0 SA if you use anything that's 4.0 SA." That's good news if I read it wrong. So including it in the game doesn't count as "remixing, transforming, or building upon the material?"

Steam? no. Unless the developer explicitly obfuscates the assets, steam doesn't prevent users from accessing game files. Unity? ...hmm... As long as you're making the asset itself (plus all derivatives) available to the people who are downloading/playing your game, it shouldn't be a DRM issue, but I don't know what options are needed to include un-obfuscated assets with a unity game.

Yes, taking this song and remixing, transforming, or building upon this song is subject to the SA clause, but how exactly would you create game code or graphical artwork by remixing a song? How would you build upon music to get a character storyline? Just as using a CC-BY-SA photo in a photo album doesn't make the entire photo album CC-BY-SA, so also using an asset in a game doesn't make the game a remix of the asset. 

There is a whole licensing discussion that could surround this topic, so I would recommend moving any further questions about the quirks of the license itself to the forums so we don't go off topic on Chance de la Soul's submission here. 

The best practice when you're unsure is to simply ask the author if they're ok with your use of it. You can ask them to change the license as well (as above), but that is generally less agreeable to the author than just asking for clarification of use. However, authors are often unavailable to reply, so you may ultimately have to decide for yourself if your use is within the author's wishes based on your understanding of the license they chose.