Angela Patua was not born to sing background music. When she performs her regular Sunday gig at Big Fish Mayaimi, she commands attention with rousing chants and deep ballads accompanied by guitar, dancing, and sometimes indecipherable patter. Her spirit moves, her music transcends. A country girl from southeast Brazil, Patua sings in African Yoruba and native Brazilian dialects, as well as in Portuguese and English. Creating her own fusion of Afro-Brazilian folkloric music and blues, she croons about the community of man and the preservation of nature with a sincerity rarely heard these days. "I want to sing for a better world," she says with conviction. At age 38 Patua recently recorded her first CD, Brazil Bantu, for Miami's Out There label. She sings frequently at area clubs and festivals, and says she wants to promote a sense of community among Miami's musicians. It takes plenty of talent to back up such unabashed idealism. Patua has plenty.