Droit du seigneur
In Mozart's "The Marriage of Figaro", which premiered in 1786 with a libretto by Lorenzo Da Ponte, the comic plot revolves around the successful efforts of the young bride and groom, Figaro and Susanna, to block the efforts of the unfaithful Count Almaviva to seduce Susanna. To achieve his aim, the frustrated Count threatens to reinstitute "droit du seigneur". It was based on a play by Pierre Beaumarchais.
Piano Concerto No. 24 (Mozart)
Mozart composed the concerto in the winter of 1785–86, during his fourth season in Vienna. It was the third in a set of three concertos composed in quick succession, the others being No. 22 in E major and No. 23 in A major. Mozart finished composing the No. 24 shortly before the premiere of his comic opera "The Marriage of Figaro"; the two works are assigned adjacent numbers of 491 and 492 in the Köchel catalogue. Although composed at the same time, the two works contrast greatly: the opera is almost entirely in major keys while the concerto is one of Mozart's few minor-key works. The pianist and musicologist Robert D. Levin suggests that the concerto, along with the two concertos that precede it, may have served as an outlet for a darker aspect of Mozart's creativity at the time he was composing the comic opera.