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A second wave arose in the early 1990 s , spearheaded by Norwegian bands such as Mayhem , Darkthrone , Burzum , Immortal , Emperor , Satyricon and Gorgoroth .
 Mayhem, Darkthrone, Burzum, Immortal, Emperor, Satyricon, Gorgoroth
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mayhem, Darkthrone, Burzum, Immortal, Emperor, Satyricon, Gorgoroth