Immanuel Kant
Kant developed his moral philosophy in three works: "Groundwork of the Metaphysic of Morals" (1785), "Critique of Practical Reason" (1788), and "Metaphysics of Morals" (1797).
Friedrich August Kanne
Kanne wrote more than a dozen operas and works of incidental music to plays, including "La fedeltà" (1803), "Sappho" (1805), "Die Elfenköningin" (1805), "Orpheus und Eurydice" (1807), "Fernando und Miranda" (1808), "Mirandola oder Das Schwert der Rache" (1811), "Die Belagerten" (1813), "Deutscher Sinn" (1813), "Die gute Nachricht" (1814), "Das Schloß Theben oder Der Kampf der Flußgötter" (1817), "Die eiserne Jungfrau" (1822), "Malvina oder Putzerls Abenteuer" (1823), "Lindane oder Die Fee und der Haarbeutelschneider" (1824), "Die Zauberschminke oder das Land der Erfindungen" (1825), "Der Untergang des Feenreiches" (1826), "Philipp und Suschen oder Der falsche Jupiter" (1832), "Die Mainacht oder Der Blocksberg" (Berlin, 1834), partly to his own libretto. His patriotic play to which he also wrote incidental music, "Die Spinnerin am Kreuz" (1822), was for many years in repertory on Vienna stages. It has been suggested that the slow movement of Beethoven's Piano Concerto No. 4 is a piece of program music closely based on the finale of act 1 of Kanne's "Orpheus". Beethoven used a text by Kanne for his aria with chorus, "Germania", WoO 94. Kanne's further works include some symphonies, masses, piano works, and songs written to poems by Goethe, Schiller and Schlegel.