Question

what was the style of improvisational singing that this "First Lady of Song" was best known for having popularized

Answer 1

Ella Fitzgerald sang Jazz and would do
"Scat"

Answer 2

Answer: scat singing

The "First Lady of Song" was the nickname given to singer Ella Fitzgerald, an American jazz singer of the mid-20th century. She was known for the clarity of her voice and diction, and the crisp sound of her voice. However, she was also famous for her improvisational abilities. Her style of improvisation is called "scat singing" and it refers to trying to imitate the sound of musical instruments with the voice.