Super Mario Galaxy series and pretty much every mainline Mario game including the 2D ones:
Xenoblade, it's the only RPG that I've played where every single song was good:
http://www.youtube.com/watch?v=xweRl4LZlmo
Shadow of the Colossus is another game where every sond was good:
Honorable mentions go to the Zelda, Final Fantasy and Pokemon series.