The term 'A-Tisket, A-Tasket Singer' refers to the iconic jazz singer Ella Fitzgerald. Fitzgerald was an American jazz vocalist who rose to fame in the 1930s and 1940s. She was known for her improvisational scat singing and her interpretations of popular songs. Her most famous song, 'A-Tisket, A-Tasket, ' was released in 1938 and became a hit. Fitzgerald was one of the most influential jazz singers of all time and is considered one of the greatest female vocalists of the 20th century.