Johann Theodor Mosewius (1788-1858) was a singer and music director. He directed the Königsberg Opera under August von Kotzebue from 1814, and in 1816 moved to Breslau, where he founded the Singakademie and taught music at the university. Later in life he published studies of Bach’s work. He took Chladni home from Steffens’ house on the last night of his life. This letter, addressed to the operatic singer Mathilde Hellwig, begins with sympathy with her over an illness. On 4 June 1828, in a letter enclosed in correspondence with their mutual friend Franz von Schober, Mosewius had assured Schubert of his admiration for his songs, including perhaps the first independent praise of Winterreise.