A short, catchy phrase that is repeated for emphasis. It can act as a refrain, often appearing within or after the coro. The estribillo adds to the song’s memorability and invites audience participation.
The words are often used interchangeably. The coro is who sings (the chorus) and the part in which they sing; the estribillo is the short phrase they keep repeating. In son, the whole montuno was also called the estribillo.
In rumba the estribillo is the refrain with which the chorus answers the lead singer, and the sign that the dance begins.
The estribillo is a fixed anchor: once you recognise it, you know where you are in the song. A new estribillo often comes with a new gear.