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Industrial Hardcore has become a really big genre now, but its roots lie in the Hardcore Techno scene of the 90s, when artists moved away from the hoovers, synths and rave stabs - plus rap and pop samples - that defined the more "dance friendly" Gabber music which began dominating the Hardcore raves and music chain store CD compilations. They explored disturbing and surreal noize, metallic, shrill and industrial sounds with pounding, deep drums and generally full-on distortion.
While Industrial Hardcore is now usally associated with "slower" speeds in music, the Industrial Hardcore of the mid-90s was usually still quite fast and frantic.
This sound also had a huge influence on the Frenchcore, Speedcore and Breakcore genres that grew bigger and bigger after the 90s ended.