Akademik

scat singing
noun
singing jazz; the singer substitutes nonsense syllables for the words of the song and tries to sound like a musical instrument
Syn: ↑scat
Hypernyms: ↑singing, ↑vocalizing, ↑jazz

* * *

Jazz.
singing in which the singer substitutes improvised nonsense syllables for the words of a song, and tries to sound and phrase like a musical instrument.
[1925-30]

Useful english dictionary. 2012.