Great map. There might be some categories missing, couldn't find any Katatonia, Agalloch, Alcest nor Tiamat. Alcest and some Deftones are considered blackgaze and Agalloch, Wolves in the Throne Room fall more into grey metal.
It's interesting because some of these bands are older than these terms. Alcest wasn't considered blackgaze until albums inspired by their own sound became popular, for example.
Metal also has history where a genre is aesthetically defined as well as sonically, which complicates things.
I can't thank you enough for mentioning Agalloch! I used to listen to them so much in university but somehow completely forgot about them until I read this comment!
I'm going to lose myself to "The Mantle" this weekend (best part is that I can now learn to play these songs on guitar). Thank you so much again - you made my day!
Wolves in the Throne Room are RABM not grey. Their are clearly political and clearly anti NSBM and anarchists. And very clear that the musical genre is black metal.
Metal also has history where a genre is aesthetically defined as well as sonically, which complicates things.