olympics commercial for Coca-cola.Name that tune..

[janice]

Question--During the olympics there was a commercial for Coca-cola.  A black lady was walking down the sidewalk, and she would reach into her bag a pull out a bottle of Coke and hand it to whoever was closest to her at the time.  She was singing a song.  What was the name of that song?  Who was she? I loved her voice!  Whenever that commercial came on I would always turn up the volume and sing along!  Then she gave the camera a big smile at the end!  It was so heartwarming!