A vocalist, or any musician, who is a practitioner of the stylistic elements of the Cuban son, which includes the ability to improvises rhythmically, melodically, and verbally against the refrain of the coro.

In the beginning, this term designated the son singer; today, the word's use encompasses salsa singers.

Originally meaning an interpreter of the son form, it describes a lead singer with the important ability to improvise lyrics, relevant stories, and melodies. AT

a lead singer who improvises rhythmically, melodically, and verbally against the refrain of the coro (chorus)

a singer who has a talent for verbal improvisation)

son and, by extension, salsa singer.

A sonero in a strict sense, is a man/women who sings or plays the Afro-Cuban son, but now the improvising lead singer in the salsa style. A good sonero improvises rhythmically, melodically, and verbally against the refrain of the coro. The word guarachero is a synonym, though less used.