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To ad to what is already mentioned, these have some under-rated music:

Psychonauts
Painkiller
MDK 2
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serpantino: However it's extremely rare I listen to it outside of games (though I do have a few cd's of various orchestral arrangements of Nobou's works.)
Speaking of Nobou, even though I'm really not a fan of his music in general, I have to say that I love some of the Final Fantasy piano arrangements, for example:

Silence and Motion

The Successor

Jenova