According to Wikipedia:
A libretto 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 text of major liturgical works, such as Mass, requiem, and sacred cantata, or the story line of a ballet.
My recent reading of Fred Plotkin’s Opera 101… has led to me listening to and reading libretti (plural form of libretto). So, should I post reviews of such to Jorie’s Reads? Do I count these as books? What do you say?