Watch Online Free on Watchseries. Così fan tutte, comic opera in two acts by Wolfgang Amadeus Mozart that premiered in Vienna on January 26, 1790. It is the last of his three operas with librettist Lorenzo da Ponte, the first two being The Marriage of Figaro (1786) and Don Giovanni (1787). Presented by the Salzburg Marionette Theatre with narration by Sir Peter Ustinov.