Xenoblade (Opening Theme, You Shall Know Our Name, One Who Stands In Our Way, Engage the Enemy, While I Think etc.) and Super Mario Galaxy (both games) are certainly on top.
FFX as well as Skyward Sword deserves a mention. I'm amazed someone mentioned my under-rated one, though. Year Of The Dragon is such a great game, made better by the music.
What happened to my childhood hero...