This is a sub-genre of Prog I used to hate at one time, but eventually grew to LOVE!
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Where better to start than with the ones who invented it, Magma! When a buddy of mine played Magma-Live for me, it was all over! I started to check out their stuff, also enjoying MDK, Udu-Wudu (good Halloween disc BTW!
), Khontarkoz, and Attahk. Just something about C. Vander's brilliant drumming, the angry throbbing fuzz bass, Kobaian singing and the layering of ideas that really got my attention.
Venturing further, I checked out RUINS (a Japanese bass/drums duo that are wild and harrowing to say the least), Shubb Niggurath (scary Zeuhl that would be a perfect soundtrack for a HP Lovecraft story about the monster from whcih the band takes its name), Yeti ( a cool American Zeuhl band without vocals).
Not sure of where to go from here, but this sub-genre is one I can't get enough of.
Any suggestions?