A libretto is the text used in 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 text of major liturgical works, such as mass, requiem, and sacred cantata, or even the story line of a ballet. Libretto (pl. libretti), from Italian, is the diminutive of the word "libro" (book). 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. However, some ballet historians use the word libretto t
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