This word refers to a style of opera and opera performance. A singer's term, chest voice refers to a particular way of producing a tone. Notes produced by head voice are higher, rounder and usually softer. Heldentenor A heldentenor usually sings the male lead of any Wagner opera. A good Heldentenor is extremely rare.
Every opera has a libretto.
The libretto is the script, the screenplay, the book, and the lyrics of the show. The prima donna is the singer who plays the heroine. She is the main female character in an opera. In most operas, you hear sections during which a lot of action takes place quickly. The characters sing almost as if speaking, in a very free and natural rhythm.