How radio shaped popular taste
Launch library · evergreen read

Radio broadcasting gave music an entirely new kind of reach, allowing a single performance to reach vast, geographically scattered audiences all at once rather than only those who happened to be physically present at a particular live show, reach that no earlier form of musical distribution had ever managed to achieve.
This considerable reach gave radio real influence over popular taste more broadly, since widespread airplay could introduce a song to listeners who might otherwise never have encountered it through any other available means at their disposal at the time, a kind of influence built entirely on repetition rather than active choice.
Even as listening habits have shifted considerably toward on demand streaming in recent years, many of the structural instincts radio originally encouraged, memorable hooks and efficient song lengths among them, still shape how popular music is written today, instincts baked so deeply into songwriting that they rarely feel like rules at all.