Chiaroscuro is part of bel canto

Bel canto

Bel canto , along with a number of similar constructions , is an Italian opera term...

 classical singing

Singing

Singing is the act of producing musical sounds with the voice, and augments regular speech by the use of both tonality and rhythm. One who sings is called a singer or vocalist. Singers perform music known as songs that can be sung either with or without accompaniment by musical instruments...

 technique, originating in Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

, in which a brilliant sound referred to as squillo is coupled with the dark timbre

Timbre

In music, timbre is the quality of a musical note or sound or tone that distinguishes different types of sound production, such as voices and musical instruments, such as string instruments, wind instruments, and percussion instruments. The physical characteristics of sound that determine the...

produced in the singer's natural hollows and cavities. Chiaroscuro is commonly used in Opera. Within Operatic singing, especially in Italian, the vowel "Ah" is a perfect example of where Chiaroscuro can be used. When singing "Ah" it must have a bright italian "Ah," while at the same time having depth and space within the actual mouth to provide a unique balance between light and dark (space and brightness).