Watch MoviestoWatch. Acclaimed American baritone Thomas Hampson performs a variety of 19th-century songs based on Romantic-era poetry and arranged for piano and voice -- by German composer Robert Schumann. Accompanied by Wolfram Rieger on piano, Hampson sings Schumann's Zwölf Gedichte, op. 35, from poems by Justinus Kerner, and a newly discovered original version of the Dichterliebe, op. 48, from poems by Heinrich Heine.