Eternal Sonata - XB360/Cheats

From WikiCheats

New Game+ (Encore)

Complete the game once and load that save game file when promted. Doing so will garner your left over Score Pieces that you've obtained, your character's last level and the Hero Crest Plus. Doing so will unlock Encore. The enemies and bosses will be more difficult as compared to when playing for the first time.