One of the mysteries about pop is its repeatability.  The way that repetition of a song doesn't dim its power, or only at extreme degrees of repetition (absolute blanket radio coverage causing you to get temporarily get sick of a song).   A great song is that seemingly contradictory thing: the repeatable surprise. The classic pop single as a radio drama that never wears out.

This degree of repeatability is not unheard of in other forms, but is much rarer. There are a few films that can be watched over and over; a few books, likewise. But wherever plot as such is involved, the ability to repeat-view or repeat-read is severely diminished. Whereas the pop song is plotless, it offers drama without narrative. 

(Okay there are some story-songs but most pop songs do not involve a punchline or pay-off or resolution; they don't "go" anywhere; they capture a state or a moment; or there is a movement back and forth between two states, two modes of action / feeling - verse to chorus, tension and release, buildup to climax).  Rather than narratives, pop songs are dramas of energy.