Super C's soundtrack is another amazing one.
Lightning and Grenades is one of those 'first level' themes that never get old.
Silver Surfer, despite being a very difficult game, has an absolutely AWESOME soundtrack. Tim Follin composed these amazing things for such a notoriously hard game.
Another 'first level' theme that I have a soft spot for is the
Mission 1 theme from Double Dragon. Just listen to that 8-bit guitar solo at 0:55-1:17 cool:
And, since most of us know that we love Mega Man 2's soundtrack, I know that all of you would enjoy
Mega Man 9's soundtrack. The whole thing feels like a real NES soundtrack and has many diverse tracks with one of my favorites being
We're The Robots. Mega Man 10's soundtrack didn't quite meet up with MM9, but my select songs from the game are
Nitro Rider (by the great Manami Matsumae),
Polluted Pump, and my favorite one,
Solar Inferno.
As for bootleg games, I have been fond of Super Game's music in their Aladdin, Lion King, and Earthworm Jim pirates (in which they sound pretty decent for a Taiwanese pirate), Lion King 5's music, which is MILES better than its predecessor, and like RobGBA said, Dial Q for the Mega Drive. It's kinda hilarious that such great music had to go into a typical, unlicensed mahjong porno game. (also, I think Hummer Team's
AV Kyuukyoku Mahjong is likely a Famicom port of this game.)
Goodness, it feels like all of us are building a gigantic playlist and I just dumped a truckload on the construction site!