Either if they are the tunes from your childhood or a kickin' soundtrack that really grew on you lately, feel free to share! The ones that stick out in my mind(for now) are:

Super Mario world 2: Yoshi's island (SNES)- The game had very atmospheric music, and it had surprisingly diverse tracks; The overworld songs sounded lighthearted and bouncy, but it was well-balanced out by the gloominess of the castle theme, the fast-pacing boss themes, and even  badass electronic keyboard metal. The ending theme still remains as a tearjerker to this day for me!

Mother (NES/Famicom)- Some of the best NES music I have ever heard hands down. This one is unbelievably obscure when comapared to Mother 2 (Earthbound), but I'll throw in Earthbound because it's another one of my all-time favorites. :thumb:

The Mega Man NES Series- What more can I say? I love all 6 of the games' soundtracks. But more specifically, Mega Man 5 had a very strong soundtrack in my opinion, and Mega Man 3 is my personal fave.

Contra- Crisp, fast-paced, and just plain sweet. And dat bass.

Here's some good ol' Sega Genesis ones I'll put here:
Ristar the Shooting Star
Sonic 3 and Knuckles
Rocket Knight Adventures
Decap Attack