(from Italian, meaning 'little book') The text of an opera or oratorio In the past, it was printed as a booklet for the audience May or may not be written by the composer Its author is known as the librettist
That cool book with all of the words to songs and vocal notes Usually rented, so don't loose them and always use pencil (Does anyone not use pencil when marking a script?)
The literary text of an extended vocal composition such as an opera or musical comedy, whether or not it is published separately from the music The libretto of a musical comedy is sometimes called its book (Thorin)