In its call-and-response singing set to ostinato-based rhythms played on two or three squat drums ("barriles"), bomba resembles other neo-African genres in the Caribbean. Of clear African provenance is its format in which a single person emerges from an informal circle of singers to dance in front of the drummers, engaging the lead drummer in a sort of playful duel; after dancing for a while, that person is then replaced by another. While various such elements can be traced to origins in Africa or elsewhere, bomba must be regarded as a local Afro-Puerto Rican creation. Its rhythms (e.g. "seis corrido, yubá, leró", etc.), dance moves, and song lyrics that sometimes mimic farm animals(in Spanish, with some French creole words in eastern Puerto Rico) collectively constitute a unique Puerto Rican genre.