progressive thrash = NEVERMORE
Nevermore isn't power, I'd say prog thrash works though.
1. Thrash (Testament, Nevermore, Death Angel)
2. Instrumental progressive metal/rock (Dysrhythmia, Kopecky, Echosilence)
3. Celtic folk metal (Tuatha de Danann, um, Tuatha de Danann...)
4. Brutal death/black (Kult ov Azazel, Zyklon, Cryptopsy)