I wanted people to think a bit out of the most obvious choices. Half of my top 10 would basically be Final Fantasy games if I didn't enforce the rule for example. Everyone has to work within the same rules, and in general once everyone's votes are counted in it will reflect the opinion of most people. Not to mention the fact that If people could just choose as many games from a single franchise as they wanted the eventual top 50 would be exceptionally boring and repetitive.
I think my list would mostly be Final Fantasy too. So I appreciate the rules you put in place. It made me think back to some of the other games where I've really enjoyed the music. Anyway, here is my top 10.
1. Katamari Damacy (PS2)
2. Final Fantasy VII (PS1)
3. Undertale (PC/PS4)
4. Metroid (NES)
5. The Legend of Zelda (NES)
6. Donkey Kong Country (SNES)
7. Super Mario Bros. (NES)
8. Castlevania (NES)
9. Astro Boy: The Omega Factor (GBA)
10. Starfox (SNES)
Ironically, the two SNES games on this list were games where I couldn't even really get into them as games, but I can't deny that the music is really good.
Honorable Mentions: Kingdom Hearts, Portal, Ghouls and Ghosts, Earthbound, and Final Fantasy Tactics Advance (not to mention many, many other Final Fantasy games that could not be included).