A Song to Wake a Thousand Sorrows. The Song Duology, #1

A woman with unimaginable power. A king hellbent on ruling the world. An ancient force that could mean salvation or destruction. The survivor of a brutal childhood, Clare Brighton craves the kind of wealth and notoriety that will mean the horrors of her past can never again touch her. With nothing but a battered guitar and a Songweaver's talent, she comes to the capital of the Faelhorn Provinces, determined to gain her place. But there is another, more dangerous power that dwells within Clare.
An entity she calls the Song, it is ancient and fathomless.and no longer content to be held in the cage she has trapped it in. It is a power the ruthless Jackal King has long been searching for, and should he discover she possesses it, the cost will be far greater than her life. Clare has sworn that she will never again let anyone control her. But escaping the Jackal King's notice will require the one thing she never wanted to need: help.
It will come first from the two lords who have taken her under their wing. Next from the second prince of Faelhorn, who Clare alone knows is not what he seems. And finally, from the Song itself. The Song has the strength to save her-if it doesn't destroy her first.