I will probably have better ideas for this later when she's got more stuff actually back, but I feel like he and Lucy totally need to meet sometime just because Ar Tonelico's song magic is like completely structured around FEELINGS. Hymn Crystals are like supercondensed feelings. Spells get more powerful when the singer's feelings are in tune with her meatshield. Hymmnos as a language has a set of special words that go at the front of the sentence to express how you feel about what you're saying. AND SO ON.