Bay seniors who are waiting to visit Brazil when the threat of kidnapping is reduced can feel safe this Sunday In Yerba Buena Gardens when contemporary Brazilian music hits the stage. It takes off from where that girl from Ipanema last left us 50 years ago. You will feel helpless as your shoes start tapping and you move to your feet and sway to the rhythms of bossa nova, samba and the high speed syncopations of chora. This is one of the 100 outdoor programs mounted here every summer. Free. Easy BART access.