This is taxonomy I can get behind
From that compendium of wonderful things, boing boing, we find this:
My current favorite metal band, Amon Amarth is not on this flowchart, but I imagine it would be under “Foriegn Sounding” under a new bubble for “Invented Languages” or “Elvish.” Clicky on the pic for the flowchart in its full, uh, flowcharty glory.

Perfidy
GeekLethal
Inclusion of non-metal acts in this chart renders the whole enterprise faulty. Def Leppard? Faith No More? IRON BUTTERFLY?! C’mon, man.
Buckethead
Yeah, sure. You picky bastich. But the idea is still cool. Especially the pentagram layout.
Ian
TOO MUCH METAL FOR ONE HAND!! *makes two-fisted devil horns*
Murdoc
Also of interest is the Heavy Metal Band Name Generator at
http://b10m.swal.org/cgi-bin/bandname.cgi
Murdoc Online » Friday Linkzookery - 30 Jan 2009
[...] Heavy Metal band name taxonomy Cool. And don’t forget the Heavy Metal Band Name Generator I’m thinking of using “Nordic Koala” if Murdoc starts a metal band…though “Gore Hound” has a lot going for it, too. [...]