John Philip SOUSA (1854-1932). P.S.; illustrated postcard. Postcard from the Tour der Amerikanischen Militarkapelle, with 60 artists led by John Philip Sousa. Under his portrait, and between two photos representing him conducting, he signed: "John Philip Sousa"; under his signature, that of the pianist Emil von SAUER (1862-1942), who was Liszt's pupil.