Stax Records left a powerful legacy

MEMPHIS, Tenn. — One by one the teenage singers practice the opening lines to “Boogie Wonderland,” a disco-funk hit from an era before they were born, as dancers work on hip-swinging moves that require perfect choreography.

In another room, young musicians play the same song over and over on guitar, piano and drums, trying to get in rhythm and in tune before the singers and dancers join them to rehearse for an outdoor concert. The music hits a fevered high as the singers and the band mesh to recreate a pop classic....