Librettists of Mozart include Lorenzo Da Ponte and Emanuel Schikaneder
Wolfgang Amadeus Mozart, having composerd more than 20 operas in his short years of life, had several librettists. A librettist is a writer of a libretto, an Italian word meaning “little book.” In musical parlance, it is the text used for opera, operetta, oratorio, and other musical genres.
The term libretto is also sometimes used to refer to the text of major liturgical works, such as Mass, requiem, and sacred cantata. Libretto (pl. libretti), from Italian, is the diminutive of the word libro (book). The difference between the libretto and a synopsis: the libretto contains all the words and stage directions, while a synopsis summarizes the plot.
The relationship of the librettist (that is, the writer of a libretto) to the composer in the creation of a musical work has varied over the centuries, as have the sources and the writing techniques employed. In the context of a modern English-language musical theater piece, the libretto is often referred to as the book of the work.

