On the subject of music hacking...
Art of Fighting has hands down the best SNK music on SNES.
Better than the arcade version even.
But all the rest of the SNK games are pretty lacking in the music department.
Fatal Fury, in particular, has a really shitty soundtrack.
It could really use an update with better music samples.
The best example of how terrible the quality is by comparing Raiden's theme to the arcade version and then to Angela Belti's theme from Power Instinct on SNES.
Angela's theme is obviously the same sort of song as Raiden's; maybe even inspired by it.
Power Instinct might even be a good source of better samples to use.
Fatal Fury 2 and Special have their own issues, but not nearly as drastic.
All in all, Fatal Fury 2's arrangements are pretty good, they sound better to me than the arcade versions which are way too noisy. However, they too could use better quality samples.
In contrast, Fatal Fury Special sounds too much like the arcade and loses the unique feel of the Fatal Fury 2 arrangements. In fact, the only songs in Special that I can stand are the ones that were not in Fatal Fury 2.
And don't get me started on Samurai Shodown. That one's just the worst.
Both Soul Blazer and Illusion of Gaia could benefit from a restoration and retranslation.
I'm really surprised Illusion of Gaia doesn't already have something done for it.
I looked it up and there's only one hack for it at all, albeit a pretty good one.
There is apparently also an MSU-1 hack roaming around the net, but not posted on here.