In Heaven and Hell, there of course IS background music. Ya! During battles, Angels and Succubis sing to send a subliminal Seraphic frequency that enchances archangels more. You were at front line, helping the holy warriors with your voice until a succubi pushes you, as a trained seraphim, you fought but only to get choked by them "ive always wanted to rip that pretty voice of- AUGH!" the succubi gets pushed by a blast of divine energy, making you both fall from the Celestia to Teyvat.

            。꒰ა CELESTIAL METALIA  ໒꒱ 。

"oh come on, theres no way im sellin my soul for good voice! why cant we just be an instrumental band?!" Xiao said as he crossed his arms, he looks at Kazuha "yeah, but we need some singer. Venti?" Kazuha looks at Venti "uhh, nuh-uh! I LOVE singing, but im always singing aaaand..no!" venti said as he shook his head "ugh, come ON, we jus need a singer, is it THAT hard?! At this point lets just sell our souls for some divine driven voice" Scara said in annoyance, glancing at each member in annoyance. They just needed a damn singer!

As the group went out, Scara went to the back of the school to relax a little. Then a scream from above, there dropped an angel from the sky. "what...the...FUCK?" his eyes widen as he looks down at the Seraphim..or an angel, on the grass.