Challenge and change are the themes underlying the 40-plus-year career of the revered female African-American a cappella ensemble, SWEET HONEY IN THE ROCK. In the course of creating its adventurous and diverse mixture of blues, African, jazz, gospel and R&B music, with excursions into symphonic and dance theater, 23 vocalists have passed through the group, formed as a quartet in 1973 at a workshop at the D.C. Black Repertory Theater Company in Washington. Dr. Bernice Johnson Reagon, Carol Maillard, Louise Robinson, and Mie drew their name from the first song they learned, “Sweet Honey in the Rock,” based on a Biblical psalm. “Sweet Honey speaks of a land that is so rich when you break the rocks open, honey flows. And we thought it was something like us African-American women . . . strong like a rock, but inside [there’s] honey – sweet,” explains Robinson.