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Alternatively, you can just download a Genesis/Megadrive soundfont to give the vanilla MIDI soundtrack that distinctive Sega sound! ;)

Maldita Castilla also has a good Genesis-esque soundtrack that you can download for free, since the original version is freeware.

Good suggestions.
Also some good creative commons licensed community music out there done on the YM2612.
Maldita Castilla certainly had some spooky soundtrack, would go great with a dark map set.