Lot's of great listed tunes!
Here are some songs that I've been getting stuck in my head while playing around with FF4 constantly and cannot stand to hear certain tracks anymore (I'm looking at you, Red Wings and Baron Castle themes.)
Forgive me for the lack of youtube links/correct song names, as my internet is horrible and I'm not familiar with some songs' actual names.
DKC2's Lava level music
Chrono Trigger - Undersea Palace
Chrono Trigger - Sewer Music
Valkyrie Profile - The sad, amazing guitar track hard mostly during Arngim's scene and the town it takes place in.
Final Fantasy Legend III (SaGa III) - Talon Cave/ Inside the Talon tracks
Wild Arms - World Map Theme, Dungeon theme used in the Sewers under Filgaia when shit hits the fan during the Festival
Secret of Evermore - That trippy harp/guitar tune that plays when you get launched up on the mountain with the alchemit at the summit durng the Prehistoric era.
Diablo 2's version of Tristram's theme (I could listen to thig looped for an hour an not notice the time fly by one bit. It's also the music I use as the menu music in Super Smash Bros Brawl. +1 for soft-modded Wiis!)
Pokemon Red/Blue - Rocket Hideout in Celedon City. It sounds so evil and crazy for a Game Boy tune. I'd love to learn it on guitar.
Final Fantasy VII - Final Dungeon music and the music heard in the cave north of the Chocobo Farm
Conker's Bad Furday - the melody for the main hub area (where you steal the queen bee's hive from the wasps), the theme for the Dung Beetles area, and the music that plays when your flying around as a bat killing the little british squirrel villagers.
Actraiser - Fillmore, Bloodpool, and the music played during the Sim Earth portions of the game.
Fable - Oakvale, Temple of Light (sounds amazing played backwards with echo effects and some reverb)
Jurrasic Park (NES/Gameboy) - The music that plays when your running around the park is permastuck in my head for all time. There's an epic version of this song on Dwelling of Duels called Jurrasic Bass.
Resident Evil 2 - The music playing when your in the save room is another song permastuck in my head (both of them). There's an amazing version of this on one of Dwelling of Duels' horror theme months.