What style of singing involves creating words an sounds as the music is sung?

The style of singing that involves creating words and sounds as the music is sung is called "Scat singing." Scat singing is a vocal improvisation technique in which the singer improvises nonsense syllables, often imitating the sound of a musical instrument. It is a common technique used in jazz, particularly bebop and swing, but it can also be found in other genres such as blues, R&B, and funk. Scat singing allows singers to express themselves freely and creatively, and it can be used to create a sense of excitement and energy in a performance. Some famous scat singers include Ella Fitzgerald, Louis Armstrong, and Cab Calloway.