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Great book about the rise of the Berlin techno scene called Der Klang Der Familie. In my read of that, the techno of Berlin and Detroit arose organically, simultaneously, and they sort of found each other serendipitously, and were connected through clubs like Tresor and labels like Interfisch. The world wasn't as connected in the late 80's early 90's as it is today, and particularly for the sorts of people that were squatting in abandoned structures in East Berlin.