Trine features a beautiful Soundtrack by Ari Pulkkinen.
While the game's music can be easily extracted, you can purchase a higher-quality version of the soundtrack from the musician's website (www.aritunes.com). This version is available in lossless FLAC and comes with two additional tracks.
Frozenbyte forum member Laserschwert created some album art, available in this frozenbyte.com thread.