Vocal elements are about who leads vocally and how lead singer and chorus interact: from the free opening of the diana to the call-and-response of coro and pregón in the montuno.
In the montuno the chorus sings a fixed coro and the lead singer answers with an improvised pregón: the coro–pregón. The lead singer has another role as well: in many bands it is the singer who cues the gear changes and decides which coro comes next.