Mind Map - Metal

The reason all these are key elements to the metal genre, is due to peoples general understanding of what Metal is.
The fashion has developed from scruffy tshirts and jeans to skinny jeans, make up, screaming, etc.
The music itself purely the instruments listed, as having a violin in a metal song doesn't suite the genre of music.
The groups itself have expanded from a male only genre to a multi sex genre, which widens the horizons of the overall concept of Metal Core genre.