DnB tempo rose from ~130 BPM in 1990–91 to a stable 170–180 BPM by 1996, where it has remained

DnB’s tempo accelerated as the genre developed: earliest forms clocked around 130 BPM in 1990–91, rising to 155–165 BPM by 1993, and settling at 170–180 BPM from around 1996 onward. Since the mid-1990s, the mid-170s has been the hallmark tempo. Some producers in recent years have returned to slower tempos (150–170 BPM), but 170–180 remains standard. Tempo is necessary but not sufficient to identify DnB — a 140 BPM track with the same broken-beat and sub-bass elements would be classified as a DnB-influenced breakbeat track rather than DnB proper. A general upward trend in tempo has been observed throughout the genre’s evolution.

Examples

A 130 BPM breakbeat hardcore track from 1991 uses the same breaks as a 175 BPM DnB track from 1997, but the higher tempo changes the rhythmic character from groove-centred to more kinetic and urgent energy.

Assessment

Place these tempo periods in chronological order: 170–180 BPM stabilisation; 155–165 BPM period; 130 BPM origins. Explain why tempo alone does not define DnB and what additional element is required.