Based on Voltron and Lost Song, both of which are on Netflix (Lost Song is amazing-)
In the capital of the Galra Empire, there is a Songstress named Kara, guarded by 7 guards (The Paladins and Lotor). Kara's songs are rumored to bring miracles, such as healing wounds or creating fire and water. However, Emperor Zarkon wants to use Kara as a weapon in the war. Kara has fallen in love with Lotor. And there's a secret that Kara hides: Every song she sings takes away a little bit of her life.