Scat singing

Scat singing is jazz vocal improvisation using nonsense syllables or wordless sounds instead of lyrics. Singers shape these sounds into melodic and rhythmic phrases, often echoing instrumental solos.

Vocal improvisation: The spontaneous creation of music with the voice rather than the performance of fixed melodies or lyrics. Scat is a jazz-specific form of improvised vocal music.
Louis Armstrong: An American jazz trumpeter and singer whose phrasing shaped twentieth-century jazz. His 1926 recording of “Heebie Jeebies” became a landmark in scat's recorded history.
Cab Calloway: An American jazz singer and bandleader known for energetic performances and scat-inflected vocal style. His exuberant phrasing brought scat and nonsense syllables into popular entertainment.
Vocal jazz: Jazz performed with the human voice as a central melodic and expressive instrument. Scat is one of vocal jazz's clearest forms of spontaneous invention.
Singing: The production of musical tones with the human voice. Scat is a specialized way of singing, distinguished by improvised nonlexical phrasing.
Jazz improvisation: The spontaneous creation of musical material within jazz performance. Scat phrases respond to a tune and ensemble much like an instrumental solo.
Heebie Jeebies: A 1926 song recorded by Louis Armstrong and His Hot Five, widely associated with early recorded scat singing. The recording helped make scat visible to a broad listening public.
Sarah Vaughan: An American jazz singer known for her rich voice, wide range, and harmonic sophistication. Her scat solos applied instrumental-level harmonic fluency to a distinctive vocal sound.
Jazz standard: A widely performed and recorded song that forms part of the shared jazz repertoire. Familiar standards give scat singers a common melody and harmonic structure to improvise over.
Vocalese: A vocal jazz style that sets lyrics to existing instrumental solos. It uses words and fixed instrumental lines where scat invents nonlexical phrases.

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