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As music critic Jon Bush wrote in retrospect : Mainstream decline Contrary to alternative rock , which went on to become a mainstay in mainstream music and replaced the glam metal of the previous generation as the most popular form of rock music , alternative hip hop 's commercial momentum was impeded by the then also newly emerging , significantly harder-edged West Coast Gangsta rap .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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