The Pokemon songs are the biggest nostalgia for me. I get kinda sad when hearing them, as I miss the games. It wasn't so much the game as that every one of my friends had it, and all the rest of my family had it (well, them - Blue/Red and Gold/Silver).
They can make me really happy, but really sad if I am already slightly sad.
My favourite music is kinda though now. It is a toss up between OoT and SMG (which are also my two favourite games). Brawl is not counted of course, as it has the other music. I don't really get nostalgic with those two though, as I still play the Zelda games, and I played SMG less than a month ago.
I also love some of the Fire Emblem music (and I find it really odd that they used that much time on music, considering that Intelligent Systems generally use short time on games).
My Ipod has the entire Brawl soundtrack, the Ocarina of Time soundtrack and the Super Mario Galaxy soundtrack on it, and they total up more than 90% of the time I listen to my Ipod.
Music is to me maybe more important than graphics in games (note: I here use graphics as simply the looks, not including artificial intelligence and physics. AI + physics = more important than music), but of course - I don't mind getting both :D (whoops, went off topic there).
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS
