How do I stop Vanilla music from playing?

Help! I am making a custom dimension, and already put sounds/music in place in the biomes for a creepy vibe. But the vanilla music plays and completely kills that vibe, and it's so loud that I can't hear any of the custom sounds/music. I want to know how to get rid of the vanilla music in the biome or dimension without having to manually do /stopsound. I only want the custom sounds.