Darkcore

Darkcore is a genre of jungle (should not be confused with the more recent darkcore techno music, also known as doomcore) that became popular in the United Kingdom hardcore rave scene in 1993. It is recognized as being one of the direct precursors of the modern electronic music genre now known as drum and bass. Darkcore was a counter movement to the happy alternative that occurred at the same time - both styles evolving from breakbeat hardcore.

Source : http://en.wikipedia.org/wiki/Darkcore_(drum_and_bass_genre)