Alicia Keys (left) with Kathleen Battle in 2008 after performing together at the Black Ball.
Opera star Kathleen Battle has been working alongside popular songstress Alicia Keys since 2007 to help raise money for a worthy cause. This Thursday, November 7, the pair will be on the stage together once again for the Keep a Child Alive Foundation's 10th Black Ball. "An inspiring evening of music and philanthropy to benefit children and families affected by HIV in Africa and India." This year's event will also feature performances by Carole King, Laura Mvula, Ron Ayers, and others to be announced. The show takes place at the Hammerstein Ballroom in New York City. The Black Ball has raised over $18.4 million since 2004. [Source] Watch performances of the two ladies from previous years, after the jump.