The folk music and dance tradition called bomba still has a presence in Puerto Rico. Much like Cuban rumba, it is based on intricate West African percussion. The drummer's objective is usually to provoke a response from a dancer, which incites a sort of competition, with musician and dancer performing in response to the other's lead. Plena is often performed along with bomba , although the two folk music styles have very different roots. Plena is believed to derive from TaA­no and Spanish traditions and involves a ten-string guitar, called a cuatro , and a hollowed gourd, like a maraca, called a guiro . Interestingly, plena was once a means of reporting the news; singers effectively recited the day's events.