Ella Fitzgerald was an American jazz singer and songwriter who was widely regarded as one of the greatest jazz vocalists of all time. She was nicknamed the 'First Lady of Song' and 'Lady Ella, ' and her career spanned over six decades. She won 13 Grammy Awards and sold over 40 million albums. Her most famous works include 'A-Tisket, A-Tasket, ' 'Dream a Little Dream of Me, ' and 'Mack the Knife.'