DRUM AND BASS [history]
As the musical genre DnB became more polished. It starts to split into known subgenres such as jump-up. More easy drum and bass started wining many musical mainstreams and many of the producers releases were influence by techno music and the scenes of science fiction. This subgenre became known as tech step (between 1997-1998).
Drum and bass tempo is usually from 160-180 BPM/minute. For example Breakbeat also known as nu school breaks is around 130-140 BPM. The earliest old skool music was between 125 - 135 bpm in (1989/1991), jungle/breakbeat and hardcore was around 155-165 BPM. Since 1996, drum and bass tempo between is from 173 to 180 BPM. However, there are many producers who are making tracks with slower tempos (150s and 160s) the middle 170 BPM beat tempo is still the main in drum`n`bass sound.
Tracks which contain the same elements as: broken beat, bass, production techniques but which have much slower beats tempo (around 140 BPM), are called dnb influenced break beat track. Popular radio tracks like Shy FX's "Shake Ur Body" often have higher speed than tech step compilations which might reject the uninitiated very quickly from a dance floor.