I went looking for this person who lives in Finland, making Heavy Metal
with SP, just out of curiosity. Sadly I didnt find them.
However I did find AnkytG’s youtube track ‘Dopamine’ which I beleive
he posted here about 2 years ago…
I also found a reference to something called RusticFlare/Forge
which appears to mod SP to help create Metal tracks.
I searched the forum for it but couldnt find any relevant posts,
so I’ll add it here.
To quote from the Github page:
‘Forge is a live coding language for generating heavy metal music. It is based on Tidal and built within Sonic Pi.’
I’m sure we’ve got some metal heads amongst us… so maybe
this will be of use to them. 
Eli…