Lo sposo deluso

 ("The Deluded Bridegroom, or The Rivalry of Three Women for One Lover") is a two-act opera buffa, K. 430, begun by Wolfgang Amadeus Mozart in July 1783 but abandoned in November. The opera was never completed and only a 20-minute fragment from act 1 exists.
Performance history.
Mozart had originally planned to have the opera performed by a seven-member Italian troupe in Vienna. Although it was once thought that Lorenzo Da Ponte might have been the author of the libretto, scholarship by Alessandra Campana has established that the libretto was written by an unknown Italian poet for Domenico Cimarosa's opera "Le donne rivali", which he composed for the Rome carnival season of 1780. According to Neal Zaslaw, Cimarosa's librettist may have been Giuseppe Petrosellini, the house poet of the Teatro Valle where "Le donne rivali" premiered. (Petrosellini was also the probable librettist of Mozart's earlier opera "La finta giardiniera"). For "Lo sposo deluso", Mozart had the characters in "Le donne rivali" expanded from five to seven, renamed the original five, and established the cast of singers for whom he would be writing. It is unclear why he abandoned the work, although Zaslaw has proposed that it was a combination of the difficulties presented by re-writing and adapting the libretto for the Viennese audience and the fact that in 1785, Da Ponte had finally come through with the libretto for "Le nozze di Figaro".
The first recorded performance of material from "Lo sposo deluso" dates from 15 November 1797, six years after Mozart's death. Mozart's widow, Constanze, arranged for the overture and opening quartet to be performed at the Estates Theatre in Prague during a concert highlighting the musical debut of their youngest son, Franz Xavier Mozart.
In 1991, the 200th anniversary of Mozart's death, Opera North premièred "The Jewel Box", a pasticcio opera devised by Paul Griffiths. This used the existing pieces from "Lo sposo deluso" and "L'oca del Cairo" as well as arias written by Mozart for insertion into operas by Anfossi, Piccini and Cimarosa, among others. (The programme was an imagined reconstruction of a 1783 pantomime in which Mozart and Aloysia Weber are said to have taken part.)
In 2006, the 250th anniversary of Mozart's birth, the fragment of "Lo sposo deluso" received several performances, including:
Roles.
Note that the opera was unfinished and never premiered as such. The singers' names given in the table below are those for whom Mozart wrote the roles and who were to have sung in its premiere.
The setting is a seaside villa near Livorno.
The cast is nearly identical to that of the first "Le nozze di Figaro". Benucci was the first Figaro. Storace the first Susanna. Mandini the first Count Almaviva, and Bussani the first Bartolo. Both Mandini and Bussani started as tenors but by this time they were a baritone and a bass respectively.