The text of an opera is called a "libretto". It often contains both the original text (often in Italian or German) and the translation, commonly in English.
Sometimes it has troubles loading but here is the Italian libretto - I've been using Freetranslation.com to translate what I need
Turandot was created in 1926.
Libretto is the text to an Opera.
of course
Turandot - Busoni - was created in 1917.
Libretto.
The libretto is the text - the lyrics - which the composer adds music to. The score is the music on which the libretto is sung.
"Libretto" is the technical term for the text and lyrics.
The libretto.
The 'libretto' is the words or story of the opera.
Plural form of Libretto is Libretti.