The Soprano Sorceress : The First Book of the Spellsong Cycle (Spellsong Cycle‪)‬

When Anna Marshall is transported from her boring and frustrating life in Ames, Iowa, to the very different world of Erde, she's angry and confused. But she soon finds out that for the first time in her life she's uniquely powerful. In Iowa, Anna was a music teacher and small-time opera singer, but on Erde, her musical ability makes her a big-time sorceress—potentially.

First, though, she must figure out how to use her ability before the rulers kill her.