Today's episode of the Phenomenal 50 features two songs by Robert Schumann: “Botshaft,” Duet from Spanisches Liederspiel, Op. 74, No. 8 and “Das Glück,” Duet from Lieder-Album für die Jugend, Op. 79, No. 15. Both performed by soprano Judith Blegen, mezzo-soprano Frederica von Stade, and pianist Charles Wadsworth.