NES: The Mega Man! I'm still amazed that some of the most intricate and melodic music I've ever heard exists on an 8-bit MIDI.
Super NES: Earthbound, Chrono Trigger, Super Maro RPG. I have a ritual with Earthbound where I play through it but once a year, that way it is special every time. In fact, October is the month I play so I should probably get started on that. I believe this is the seventh year.
I find myself inexplicably whistling the music from Chrono Trigger from time to time, and Super Mario RPG is the epic first Mario RPG which also has good music.
Nintendo 64: Too much stuff to name, not even going to try.
GameCube: Super Smash Brothers Melee of course. Still my favourite game on the system.
Wii: The craziness of Mario Kart Wii, and the unexpected hit of Animal Crossing. There is unfortunately one negative association with this system, and that's that it has the one and only game I've ever truly felt the extreme emotion of hatred toward: Super Smash Brothers Brawl.
Game Boy: Wario Land, the one and only Game Boy game I had for a while. Technically it was my brother's, but it counts.
Game Boy Color: Zelda? I guess. I kind of skipped this system and went straight to the Game Boy Advance.
Game Boy Advance: Ports and remakes.
Nintendo DS: Hand cramps.
Sega Genesis: Despite how long it has been since this system broke, I still remember the music for Blaster Master 2. But that's all...
PlayStation: The tunes I composed using the MTV Music Generator.
XBox: FUUUUUUSION FREEEENZY!