 If you liked
Princess Tutu
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 ...then you might like
Ginga Eiyuu Densetsu
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While not similar in story or genre, both shows make extensive use of classical music during the show with obvious care taken to choose the perfect pieces for any given situation to heighten the mood. On occasion, both shows might even use the exact same piece differently and both very well. If classical music is your thing, check them both out.