"There are only two kinds of music: good music and the other kind," wrote Duke Ellington in a 1962 essay. Metal didn't even exist then – imagine that – and six decades on, it would be interesting to find out what the jazz legend would think of metal off-shoots like cybergrind and funeral doom.
In an attempt to make sense of the continually sprawling world of metal and all its subgenres, here's a comprehensive list of some umbrella terms that may have passed you by.
