The Marriage of Figaro (play)
The play formed the basis for an opera with a libretto by Lorenzo Da Ponte and music by Mozart, also called "The Marriage of Figaro" (1786). In 1799, another opera based on the same play, "La pazza giornata, ovvero Il matrimonio di Figaro", was produced in Venice with libretto by Gaetano Rossi and music by Marcos Portugal.
Ernst Lert
As a music scholar, Lert published several biographies on notable musical figures and wrote the book "Mozart auf dem Theater" ("Mozart and the Theatre", published 1918). He also contributed articles to numerous magazines, music journals, and newspapers. He wrote the libretto for Hugo Weisgall's "The Tenor" (1952) and wrote the German libretto for Riccardo Zandonai's "Die Kavaliere von Ekeby" ("I cavalieri di Ekebù").