Ella Fitzgerald, also known as the 'First Lady of Song' and the 'Queen of Jazz, ' was a renowned American jazz singer and songwriter who was often referred to as the 'Scat Queen.' She was one of the most influential jazz singers of the 20th century, and her career spanned over six decades. She won 13 Grammy Awards and was the first African-American woman to win a Grammy Award. Her signature style of scat singing, which she developed in the 1930s, was characterized by her improvisational vocalizations and melodic phrasing.