"Darkcore is a subgenre of jungle (not be confused with the more recent developments of Hardcore) that became popular in the United Kingdom hardcore rave scene in late 1992. It is recognized as being one of the direct precursors of the 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. The name was most likely derived from the track "Darkcore" by Two Dark Troopers, released on Basement Records in 1993."
"Darkcore is characterized by layered breakbeats at around 150 to 160 bpm combined with very low frequency bass lines. In addition to these basic traits, dark themed samples such as horror movie theme music or cries for help were commonly included. As the style evolved, the almost gratuitous use of horror elements was dropped as producers relied more on simple effects such as reverb, delay, pitch shifting and time stretching to create a chaotic and sinister mood. "