Final answer:
Jazz vocal improvisation sometimes uses nonsense syllables to make new melodies. This technique is called scat singing.
Step-by-step explanation:
Jazz vocal improvisation sometimes uses nonsense syllables to make new melodies. This technique is called scat singing. Scat singing involves the singer creating improvised melodies by using nonsense syllables, rather than singing lyrics. Through scat singing, vocalists can explore different rhythms, patterns, and melodic ideas, adding a unique and improvisational element to their performance.
Learn more about scat singing