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Hip Hop is a cauldron of conformity

Analysis shows that samples stay consistent over decades.

Iconic hip hop group N.W.A's hit Straight Outta Compton used a sample drum beat from a relatively little known soul band. 
Iconic hip hop group N.W.A's hit Straight Outta Compton used a sample drum beat from a relatively little known soul band. Credit: Raymond Boyd/Michael Ochs/Archives/Getty Images