Pierre Beaumarchais
In 1786, Wolfgang Amadeus Mozart composed an opera, "Le Nozze di Figaro", based on "The Marriage of Figaro", with a libretto by Lorenzo Da Ponte based on the play. Several composers including Paisiello in 1782 wrote operas based on "The Barber of Seville". Rossini's 1816 version is his most successful work and still often performed. In 1966, Darius Milhaud composed an opera, "La mère coupable", based on "The Guilty Mother".
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").