heavy metal 

No offence but I don’t care if you’re offended. Heavy metal music shouldn’t even be categorised as music and this is why;

vocal or instrumental sounds (or both) combined in such a way as to produce beauty of form, harmony, and expression of emotion.
I don’t know about you, but I don’t think there’s anything remotely harmonious about a bunch of angry dudes quite literally destroying their instruments, and I also see nothing at all ‘beautiful’ about one or more of sed dudes yelling into a microphone about death and pain or like they’re being chased by the Incredible Hulk wearing a Paul’s Boutique jacket and carrying an AK47.
The other thing is that these bands must be under the impression that their entire fanbase is suffering some kind of auditory defficiency disorder because why the hell else would you record your music at about 60000 decibels (I don’t actually know how loud that is but you catch my drift). I am genuinely conserned about the health of the future generation.