On a cloudy Saturday morning, Carmen Román and her husband, Pierr Padilla, filled the basement of the Golden Gate Library in Oakland with a symphony of sounds, using their feet, hands and traditional Afro-Peruvian instruments. A small group of children shrieked with glee and bumbled around the room, dancing as their parents nodded to the beat being created by Román and Padilla opening and closing the top to their cajitas, a box-shaped Latin percussion instrument, and hitting it with a…