Megaman 10 music by Franpa at 8:52 AM EDT on June 30, 2011
Is there any copies of the music in the same/similar format to the Megaman 9 ones (NSF/S3M)? As the file size is significantly smaller in said formats then whatever the native format used on the xbox360 version of the game is.
Fan-made remakes for the actual NES hardware that don't quite sound like the original music?
TSSF remade the entire MM10 soundtrack in nsf on Famitracker:
http://tssf.gamemusic.ca/Remakes/mm10nsf.zip
I'm a little confused why you're asking though. "mega man 10 nsf" in google brings up page after page (after page) with that same link.
I would just download or purchase the official OST release. Those nsf fan remakes of MM9 and MM10 aren't really "THE music". There's a lot more differences than just file size here...
Because, as I already said, those nsf/s3m done by TSSF are NOT the actual and original music. And professionally mastered OST CD releases are usually better sounding than game rips.
You know how the author of the NSF version is wondering why they used more channels then the NES could handle? Capcom may have taken into account special audio chips like what the Japanese Castlevania game used. Pretty sad such a chip could never work on a NES due to the NES design lacking the necessary pins in the cartridge slot.