Left to right: Aimee Mann, Sheryl Crow, Suzanne Vega.

Frank Micelotta/ImageDirect/Getty Images/Hulton Archive hide caption

itoggle caption Frank Micelotta/ImageDirect/Getty Images/Hulton Archive

Sheryl Crow performs at the Children Mending Hearts Gala in Hollywood on Feb. 18, 2009. Jason Merritt/Getty Images hide caption

itoggle caption Jason Merritt/Getty Images