L-R: Lizz Wright, Angelique Kidjo and Dianne Reeves perform at the 2011 Detroit Jazz Festival. Jeff Forman/Courtesy of the artist hide caption

itoggle caption Jeff Forman/Courtesy of the artist

Geri Allen (left) and Esperanza Spalding perform together at the Mary Lou Williams Festival in 2010. Margot Schulman/ hide caption

itoggle caption Margot Schulman/