Singing the Scales: A Reverse Harem Musical Romance (Spellsinger #13)

Learning to sing these scales could kill a girl.

The RS is finally under control, thanks to a spell cast by the elemental Witch Leaders. But Elaria only survived that casting because King Verin of the Azure Court offered himself to fuel the RS. And Verin was only able to do that because of yet another spell that Vivian, the Leader of Water, cast upon Verin and Elaria—a love spell. That love spell should have faded but instead has grown in strength. As Elaria and Verin fall deeper under its thrall, it slowly becomes clear that there may be something more sinister than love magic at work. Can Elaria and her men uncover the truth and unmask her enemies or will love destroy them all?

Spellsing in order:
The Spellsinger Series
1. The Last Lullaby
2. A Symphony of Sirens
3. A Harmony of Hearts
4. Primeval Prelude
5. Ballad of Blood
6. A Deadly Duet
7. Macabre Melody
8. Aria of the Gods
9. Anthem of Ashes
10. A Chorus of Cats
11. Doppelganger Dirge
12. Out of Tune
13. Singing the Scales