So what's your book about anyway?

I started writing the next post about all the things I need to do to revise my manuscript and realized that absolutely none of it would make sense unless I first gave at least an overview of what my book is about. Well, here is the pitch paragraph of my query to agents (that I can hopefully send out soon!):

SONG OF THE PROPHECY is set in a world where the gods have demanded exorbitant amounts of sacrifice for hundreds of years, causing devastating natural disasters when they don’t get what they want. Only the cantelli, women with power in their voices, have been able to keep the gods from wreaking complete havoc. When a mysterious god starts demanding human sacrifice, the cantella Mavelle is told that she is the one prophesized to defeat him. Despite the wealth being a cantella has brought her, Mavelle longs for a normal life. With her desire for freedom eating at her willpower and her voice her only weapon, will she be able to destroy a god?

On her journey Mavelle fights the gods, falls in love, discovers an ancient power and makes some sacrifices of her own. I don't want to give too much way here. I want everyone to read the whole thing when it's published. *crosses fingers* The synopsis that I'm having a horrible time with will give away the ending, of course, because that's what agents want.

Feel free to comment and let me know what you'd do if you were an agent. Would you request a partial manscript from me?