In case you don't know, the Famicom Disk System was a peripheral for the Famicom (Japanese NES) that allowed it to use floppy disks instead of cartridges. It was never released outside of Japan due to a massive piracy problem, so certain games were converted from disk to cartridge when released outside of Japan. The most important aspect of this for our purposes is that the FDS had an additional sound channel over the NES, which meant that the American versions of some games had sadly inferior soundtracks. Nintendo seems to recognize this, as the "3D Classics" re-release of Kid Icarus uses the FDS soundtrack rather than the original, and recurring themes in the Metroid games are based mostly on the FDS version of Metroid rather than the NES version. Furthermore, the soundtrack of the Japanese version of Castlevania III is considered one of the greatest 8-bit soundtracks of all time. Since the FDS music is better, I think we should use it in SMBC. As far as I know, this affects the following games: Castlevania II Castlevania III Kid Icarus Metroid (NOTE: The NES version of the "Escape" track is extended, so it might be better to use that one) The Legend of Zelda (Though I think the differences are pretty minor for this one) Zelda II: The Adventure of Link I think the FDS version of Super Mario Bros. has slightly different percussion, although it's hardly noticeable I'm pretty sure the Mega Man series, the Ninja Gaiden series, the Contra series, Blaster Master, and the first Castlevania have no different FDS soundtracks. If replacing all of this music is too much work, then focus on Kid Icarus and especially Castlevania III because those games have amazing FDS soundtracks and it'd be a crime not to include them in SMBC. Oh, and if someone doesn't care for a particular game's FDS soundtrack (or even a particular track), that can be discussed here.