Walther von Goethe (1818-1885), grandson and last living descendant of Johann Wolfgang von Goethe, was a composer and court chamberlain. His German wikipedia entry has a partial work list, and there is a concert of his songs and piano pieces, also works by other composers, on Youtube with soprano Paula Bär-Giese, accompanying herself on the Lyraflügel, Benedictus Schleip, Berlin ca 1848. The full concert is available on Soundcloud.