Heavy: UK, USA, Germany, Argentina, Japan
Thrash: USA (San Francisco + NYC), Germany, Canada, Brazil, Chile
Death: USA (Florida + NYC), Sweden (Stockholm + Gothenburg), Finland, UK, Canada, Netherlands, Poland, Indonesia
Black: Norway, Sweden, Finland, France, USA (Pacific Northwest), Greece, Ukraine/Eastern Europe, Canada (Quebec)
Doom: USA (DC + Louisiana + Southwest), UK, Finland, Sweden, Norway, Italy
Power: Germany, Sweden, Japan, Finland, USA, Italy, Spain
Metalcore: USA (Massachusetts + Ohio + California), UK, Australia, Germany
Progressive: USA, Sweden, Canada Symphonic: Finland, Netherlands, Germany, Japan, Italy
Folk: Finland, Germany, Eastern Europe, Scandinavia/Iceland, Ireland

Do you overall agree or disagree? What countries can I add, omit, or rearrange?

better readability:
>Heavy
UK, USA, Germany, Argentina, Japan
>Thrash
USA (San Francisco + NYC), Germany, Canada, Brazil, Chile (also adding Australia here)
>Death
USA (Florida + NYC), Sweden (Stockholm + Gothenburg), Finland, UK, Canada, Netherlands, Poland, Indonesia
>Black
Norway, Sweden, Finland, France, USA (Pacific Northwest), Greece, Ukraine/Eastern Europe, Canada (Quebec)
>Doom
USA (DC + Louisiana + Southwest), UK, Finland, Sweden, Norway, Italy
>Power
Germany, Sweden, Japan, Finland, USA, Italy, Spain
>Metalcore
USA (Massachusetts + Ohio + California), UK, Australia, Germany
>Progressive
USA, Sweden, Canada Symphonic: Finland, Netherlands, Germany, Japan, Italy
>Folk
Finland, Germany, Eastern Europe, Scandinavia/Iceland, Ireland

>>127125679 (OP)
seems about right. add melodeath

>>127126224
sweden, finland, usa, uk

still looking through melodeath scenes, but this is what i got so far

>>127125679 (OP)
>>127125704
I think you should just go by bands, records, etc. At least first and foremost. Everyone of those needs to have a song etc.