“The words need to float above the orchestra,” composer Laura Karpman instructs world-renown soprano Jessye Norman who is singing passages of Langston Hughes’ most ambitious though nearly forgotten work, his 1960s epic poem Ask Your Mama: 12 Moods for Jazz. Sitting in folding chairs in a Carnegie Hall rehearsal room, Norman and Karpman, along with mezzo-soprano Tracie Luck and jazz vocalist de’Adre Aziza, prepare for the first major performance of Hughes’s jazz poem, which premieres on March 16 at the historic theater.

“Of course,” replies Norman, who has sung at the hall dozens of times. She lifts her chin, and in the voice that has thrilled millions of grand opera lovers the words take flight, soaring to the rafters. But this music isn’t about a tragic heroine; it’s about the African American experience.