We Are The Song By Catherine Bakewell

A lush and beautiful fantasy set in a world where music is magic and the fate of many thrones lies with one girl...
Twelve-year-old Elissa has been raised in seclusion as a devotee of the Mother Goddess. She is a special child, a blessed child, a child who can sing miracles into being. Her voice can heal wounds, halt landslides, cure hunger--and even end wars.
But there are those who would use her gift for darker things. And when Elissa finds herself the farthest from home she's ever been--along with her vain and jealous music tutor, Lucio--she will have to develop the judgment to decide who wants to use her song to heal... and who wants to use her song to hurt.