discarded Lo sposo deluso of 1783/84 has now been generally rejected. Mozart felt that, as the composer, he should have considerable input into the content of the libretto, so that it would best serve the music. Musicologist Charles Rosen writes, "it is possible that Da Ponte understood the dramatic necessities of Mozart's style without prompting; but before his association with da Ponte, Mozart had already bullied several librettists into giving him the dramatically shaped ensembles he loved." Compiling the list Basis for inclusion The list includes all the theatrical works generally accepted as composed by Wolfgang Amadeus Mozart. In this context "theatrical" means performed on a stage, by vocalists singing in character, in accordance with stage directions. Some sources have adopted more specific criteria, leading them to exclude the early "Sacred Singspiel" Die Schuldigkeit des ersten Gebots, which they classify as an oratorio. However, as Osborne makes clear, the libretto contains stage directions which suggest that the work was acted, not merely sung, and it is formally described as a "geistliches Singspiel" (sacred play with music), not as an oratorio. The Singspiel Der Stein der Weisen was written in collaboration with four other composers, so it is only partially credited to Mozart. Sequence In general, the list follows the sequence in which the operas were written. There is uncertainty about whether La finta semplice was written before or after Bastien und Bastienne, and in some listings the former is given priority. Thamos was written in two segments, the earlier in 1774, but is listed in accordance with its completion in 1779–80. Die Zauberflöte and La clemenza di Tito were written concurrently. Die Zauberflote was started earlier and put aside for the Tito commission, which was completed and performed first and is usually listed as the earlier work despite having a higher Köchel catalogue number. List of operas Key: Incomplete opera Collaborative work Notes References Citations Cited sources Further reading External links Opera libretti, critical editions, diplomatic editions, source evaluation (German only), links to online DME recordings; Digital Mozart Edition Operas Mozart