The American mezzo-soprano performs from the converted art-nouveau Jahrhunderthalle in Bochum, Germany. The program includes the world premiere of “I Dream a World,” a new work with music by Kenyatta Hughes and text from the Langston Hughes poem of the same name. The concert also features Baroque works by Handel and Monteverdi as well as well-known songs such as “La vie en rose” and Rodgers and Hammerstein’s “You’ll Never Walk Alone.” The singer is accompanied by Carrie-Ann Matheson on piano and the chamber music ensemble Il Pomo d’Oro. Recorded last September, it premieres Friday, July 2 on PBS (check local listings).