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The Legendary Score is a book of music that contains magical notes and originally contained "The Melody of Happiness". When sung by the right person/fairy it has the ability to bring hope and peace to all worlds but the notes can be rearranged to have other effects such as when Mephisto used it to create the "Melody of Sadness". The notes it contains also seem to be alive and Aphrodite comments to Hummy if the song is not sung just right the notes could escape the book.