How a hook grabs the ear
Launch library · evergreen read

A hook works because it asks almost nothing of the listener before it lands, whether it takes the shape of a melodic phrase, a rhythmic pattern or a single repeated word, and its whole job is simply to lodge itself in memory within the first few listens, no explanation ever required, no context necessary at all.
Simplicity is usually the secret ingredient behind a hook that actually sticks, since the most durable ones tend to lean on short phrases and predictable, easily anticipated shapes, because anything too intricate or clever quickly becomes harder for an ordinary listener to recall, and harder still to eventually sing back on their own.
Placement matters every bit as much as content when it comes to making a hook land properly, and a phrase introduced early, then returned to at key moments throughout the song, gives the listener a genuine sense of familiarity to hold onto, turning one small, repeated idea into the whole song's anchor by the end.