Who rocks it better? Keri Hilson, Demetria McKinney sing ‘Happy Birthday!’ Atlanta’s leading live music series, ATL Live on the Park, produced by Shanti Das and Marlon Nichols, returns for new season. At the season opener R&B’s Keri Hilson and Demetria McKinney sang “Happy Birthday” to a group of ladies. Yvette Caslin I'm a writer, image architect & significance marketer. Love photojournalism, creative expression & originality.