Sonero
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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.
According to Luis Tamargo, senior editor of Latin Beat magazine and music historian, at first, anybody who played the son, whether singer or instrumentalist, was a sonero. However, he says that "in recent decades, particularly since the 1960s, people have identified the word 'sonero' with the singers."
[edit] References used in article
www.latinsheetmusic.com/terms5.html
www.salsacubana.no/dictio.htm