What is Non-mainstream Music?
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Pretty much the opposite of Mainstream music. Rarely, if ever, gets on the radio or top 40, and it's not usually well known to the general public. Also known as "Underground Music".
Non-mainstream music includes bands/artists such as Dream Theater, Porcupine Tree, Dälek, etc.
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underfuckingstand - Understand, with "Fucking" inserted in the middle, making it an exclamation of frustration or, in some cas..