What Is a Music Genre? Popular Music Genres at Breakout and Crest

2. Breakout

At some point the genre breaks out as a widely recognized musical phenomenon in popular culture.
The new style attracts the attention of masses of people, including musicians just getting started, musicians working in other genres, music consumers, and music business people
Suddenly, performers everywhere are playing in the new style. Lots of the new music get recorded and sold. Over a comparatively short period of time, the new genre or sub-genre becomes all the rage.

3. Crest

Inevitably, within a decade or two, the popularity of the genre crests and starts to subside.
Along the way, it spins off numerous sub-genres.
The original one does not go away