What's the Metal Version of the Rule 34 Ideas?

The metal scene has come to encompass a lot of different sounds and ideas, but i don't know if they've gotten around toa whistling. Among various chinese minorities whistling while you work as ening snow white was thought to summon demons to damage crops. In mithraism there is a system of whistling and tongue clicking that was used to attract what sou refers to as thereomorphic star deities.