Noun
A book containing the words of an opera or extended piece of music.
The words themselves.
Source: Webster's dictionaryAccepting the offer 5 January, Bellini stated that he would set Romani's libretto for Giulietta Capellio, that he required 45 days between receipt of the libretto and the first performance, and that he would accept 325 napoleoni d'oro (about 8,000 lire). Source: Internet
A." Donizetti so dominated the preparation of the libretto that Ruffini refused to allow his name to be put on the score. Source: Internet
A libretto is distinct from a synopsis or scenario of the plot, in that the libretto contains all the words and stage directions, while a synopsis summarizes the plot. Source: Internet
After further work on the libretto by Georg Friedrich Treitschke a final version performed at the Kärntnertortheater on 23 May 1814. Source: Internet
Add to this some structural problems with the libretto, and the opera's failure to make headway - despite an admirable and impressive score - becomes comprehensible. Source: Internet
Although this failed and was withdrawn after 11 performances, Dean 1965, pp. 97–98 it led to a further commission from the theatre, this time for a full-length opera for which Henri Meilhac and Ludovic Halévy would provide the libretto. Source: Internet