The Singer of All Songs by Kate Constable (Scholastic)
Calwyn is a priestess with the ability to sing ice, a wall of which protects her village. When word comes that an evil sorcerer plans to learn this and other song magic, and theoretically control the world as The Singer of All Songs, Calwyn decides she has to be part of the battle for good. An ensemble cast broadens her power of the non-singing sort. As a musician, I was thrilled to find a book that combined magic and music (if they can be said to be separate!), and though I didn't remember to pick up the rest of the trilogy when it was published, I might do that now out of curiosity, particularly to see how the author fleshes out the rules and world.