The Underground remixer reference article from the English Wikipedia on 24-Apr-2004
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Underground remixer

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Remixing is a popular form of musical creation by taking an already recorded song's parts and reforming an entirely new song. "Underground Remixers" are a group of people born mostly in the information age; as opposed to an officially sanctioned remix done with the permission of artist/label by a professional, underground remixers do less-professional mixes that are distributed freely on the internet.