¶ Vanilla Sounds & Music
It's possible to use Vanilla Minecraft's sounds and music in Audio elements and other stuff that take OGG audio files.
¶ Accessing Vanilla Sound Resources
To access Vanilla sound resources, you need to know their real resource location.
For example, the bromeliad.ogg music track is located at assets/minecraft/sounds/music/game/, so its resource location would be minecraft:sounds/music/game/bromeliad.ogg.
This image shows the resource location used in an Audio element:
An easy way to see the real resource locations of audio files is by using mcasset.cloud.
This website lets you browse Minecraft's assets.