Which of these genres use a libretto? opera prelude oratorio concerto

Libretto could mean the words in operas. But another meaning would be text which is used for musical works like operas, operattas, cantatas, oratorio, and masque.

The correct option to answer this question is:

Opera.

Explanation:

The opera is usually differentiated from the other genres of musical theater accepting that, the opera is a representation completely accompanied by music. This representation is based in a libretto which is an history.

Answerthe theatre of the fourth wall removed

They are not affected because the paint drys with the plaster on the wall, effectively making the fresco part of the wall.