This opera is Wolfgang Amadeus Mozart's "The Marriage of Figaro". It is known as "Le Nozze di Figaro" in the original Italian.
Answer:
It's always the art questions that don't actually need help with something lol :p
Explanation:
The correct answer is :
A second voice
Explanation:
As no genuine independent other voice exists, this is a form of heterophony. In its earliest stages, organum needed two musical voices: a Gregorian chant melody, and the same music transferred by a consonant interim, regularly a complete fifth or fourth.