I'd like to see a study like this done on members of the Norwegian black metal scene from the early 90s. Because I still can't figure out what the burnings and stuff were about (aside from paganism, I guess), and “TROO” metalheads sound pretty crazy even compared to all the other ‘alternative’ culture aficionados. But generally, of course, this experiment seems like just one bit of a proper comprehensive study.
Burnings where the extreme outliers, maybe like there where some killings in the American hip-hop scene at the same time. Remember that the (black) metal scene in Norway was so large that in the late '90s a black metal band had a song in the national top 20 list for weeks (Satyricon, fuel for hatred). What a handful of persons taking it to the extreme, did do not define the scene Edit: Don't underestimate the calming…
For a looong time, I've been looking for techno or breakbeat with proper metal, i.e. more than some vague guitar buzz. No luck.
Filmmaker's ‘Crepuscular’ might be the closest thing yet: https://www.youtube.com/watch?v=1XvB64VU3yw
For some reason, a steady rhythm vastly outperforms anything else as a soundtrack for coding.