Was the human voice used in Jazz music?

Yes, the human voice was used in Jazz music. Jazz music incorporated various forms of vocal expression, including singing, scat singing, and vocalese. Scat singing is a vocal improvisation technique where nonsense syllables and sounds are used to create melodic lines and rhythms. Vocalese is a form of jazz singing where lyrics are added to existing instrumental jazz melodies or improvisations. Singers like Ella Fitzgerald, Louis Armstrong, Billie Holiday, and Sarah Vaughan are notable examples of jazz musicians who used their voices in innovative and expressive ways within the genre.