The term "bass music" gets used as an umbrella for DnB, dubstep, UK garage, footwork, halftime, and a few other adjacent genres. The umbrella is useful and slightly meaningless. Worth unpacking.

What the umbrella catches

Any electronic genre whose central organising element is sub-bass. Tempos vary widely (130 to 175 BPM). Drum patterns vary widely. The shared trait is that the bass is the structural backbone rather than a decorative element. That definition includes most of UK underground electronic music.

Why the umbrella exists

Festivals need a programming term. Promoters need a marketing term. DJs need a way to describe sets that move between adjacent tempos and styles. "Bass music" handles all three jobs.

Why it dissolves DnB identity

The downside: when DnB gets folded into "bass music", its specific 174 BPM identity gets diluted. Younger listeners discovering the umbrella often do not separate DnB from dubstep cleanly. The genre identity has to keep being reinforced from the inside.