QUITE a bit late, but if you're still looking for programs to use:
SNESMod (an IT to SPC converter)
XMSNES (an XM to SPC converter) -you'll have to search for this one, or compile it-
IT2AMK (IT to SPC and MML, for AddMusicK, converter)
chipsynth SFC (by Plogue, brand new VST plugin for DAW's to create authentic SNES music, but no export to SPC) *non-free*
Super Audio Cart (by ImpactSoundworks, gives you SNES-like samples with the SNES Verb plugin they created) *non-free*
SNES Tracker (by bazzinotti, newly released with still very early builds, it's a true SNES Tracker program that outputs to WAV and SPC)
If you don't want to jump through major hoops to get authentic music, go with Super Audio Cart. If you want authenticity and are not worried about SPC output, I HIGHLY recommend chipsynth SFC. For the nitty gritty, get your hands dirty and learn some tools deal, then go with IT2AMK, SNESMod or even the new SNES Tracker (if you don't mind using music tracking software). I prefer IT2AMK due to having ASDR envelopes instead of pure gain like XMSNES and SNESMod does (which creates a lot of popping).
Highest recommendation is chipsynth SFC, however. Once you learn how to use it, and it's on sale right now for chump change, you'll be able to bust out authentic 8-channel limited SNES tunes with true SNES echo effects. If you need guides on how to use it, check out tssf (Mathew Valente's) YT channel for a series on how to use it.
SNES music, video game music remakes, maybe throw in a little Mario Maker! Well known for my work on Chrono Resurrection as well as Infinity GBC
www.youtube.com
Enjoy the plethora of tools!