They were
Da Ponte, Mozart Librettist wrote Mozart's 3 best Operas - Figaro, Giovanni and Così Fan Tutte.
On paper
He wrote more than one, but the most famous is probably the "Marriage of Fiagaro"
Wolfgang Mozart
Mozart composed operas in German and Italian. Don Giovanni, Le nozze di Figaro, and Così fan tutteare three of his most popular Italian operas.
Mozart
What instruments did Mozart play? Pianoforte (clavier), violin, organ, harpsichord, and viola.
Mozart was a composer of the Classical period and applied his genious to operas and virtuoso concertos.
Modern ones still do, yes. Old operas by Mozart, Wagner, or Verdi are now public domain,
Richard Strauss. Mozart.
Zaide is an unfinished Opera by Mozart. He started its composition in 1780.
Mozart composed numerous operas - musical plays - which are still performed today.