sentences:  The group AfroCuba de Matanzas, founded in 1957, added batá drums to the traditional rumba ensemble in their style, known as batá-rumba.More recently, a cappella (vocals-only, without instruments) rumba has been performed by the Cuban ensemble Vocal Sampling, as heard in their song "Conga Yambumba".Although rumba is played predominantly in binary meter (duple pulse