I can't believe I forgot about Castlevania! One of the biggest reasons I bought Dawn of Sorrow was because I heard the Village music, and had to have the game.
And Donkey Kong Country is a great series. I especially enjoyed the Orchestral Game Concert's version of Water Music, when it transitioned between the water levels and the main theme.
And Symphonia had a nice one too. I was especially taken with the ninja woman's theme (her name escapes me right now).
Another series is the Chrono one (even if there are only two games in it so far). The main theme in particular puts a smile on my face.
http://www.youtube.com/watch?v=aPr-YAOZE7I







