Merlin can hear the life of everything in the world.

[moonflowerkc]

I'm looking for a long fic where Merlin hears the "music" of everything in the world, the trees, grass, bugs. Just everything in life. It's a part of him. What I remember is the battle near the end of the fic that the enemy (maybe Morgause and Morgana?) stole that gift from him, or maybe Merlin unleashed it on them. They wanted the power they thought should be theirs, but once reality happens, they can't handle all the sounds and goes insane. I'm pretty sure it's Arthur/Merlin.

Thanks for any help.