Jazz technique WSJ Crossword Clue

Think of a musical conversation without words, where the voice dances like an instrument.

???? is a style of jazz singing where the singer uses improvised syllables and sounds instead of words.

The clue 'Jazz technique' refers to a unique vocal style used in jazz music where singers use improvised, nonsensical syllables to create melodies. '????' singing is characterized by its rhythmic and melodic vocal improvisation, often emulating instrumental solos.

Improvised jazz style, Get ad-libby-dibby while singy-ingy-inging?, Improvisational vocal style, Improvise à la Ella Fitzgerald, Riff like Ella Fitzgerald