In 1971, Jacqueline Kennedy Onassis asked Leonard Bernstein to compose a new work to celebrate the opening of the JohnF.KennedyCenter for the Performing Arts in WashingtonDC.The piece he wrote, Mass, requires hundreds of performers and spans genres from traditional symphonic music to blues to rock and roll.Last autumn Baltimore Symphony Orchestra music director Marin Alsop led the BSO, the Morgan State University Choir, and the Peabody Children’s Chorus as they teamed up to perform the piece.Alsop and Dr. Eric Conway, Director of the Morgan Choir, joined Marc in the studio to discuss the piece and the new CD of the performance.