A Rough Guide to Metal Subgenres - Part 1

I decided to make this series, partly to entertain fellow metal fans, but also as something that you can share with your non-metal friends to explain all this stuff to them.

Part one of many. If there's something that you think I've missed out, it may be covered in the next part.

Timestamps:
My labelling system - 3:23
Proto Metal - 5:35
Heavy Metal - 6:54 (NWOBHM 8:20) (Glam 10:36)
Doom Metal - 12:52 (Drone 14:12) (Stoner 14:50) (Sludge 15:42)
Black Metal - 16:34 (2nd wave 20:17)

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