Libretto
Text used in an extended musical work such as an opera or musical
A libretto (from the Italian word libretto, lit. 'booklet') is the text used in, or intended for, an extended musical work such as an opera, operetta, masque, oratorio, cantata or musical. The term libretto is also sometimes used to refer to the story line of a ballet or the texts of major liturgical works, such as the Mass, requiem, or sacred cantata. The Italian word libretto (pronounced [liˈbretto], plural libretti [liˈbretti]) is the diminutive of the word libro ("book").
From Wikipedia, under CC BY-SA. More on occurri.