Final answer:
Ella Fitzgerald won a talent show at the Apollo Theater at age 17 and performed with the orchestra at the Savoy Ballroom.
Step-by-step explanation:
The singer who won a talent show at the Apollo Theater at age 17 and was the featured singer with the orchestra at the Savoy Ballroom was Ella Fitzgerald. Ella Fitzgerald was a renowned American jazz singer who became one of the most celebrated vocalists in the world. She started her career by winning a talent show at the Apollo Theater in 1934 when she was just 17 years old, and went on to perform with the Chick Webb Orchestra at the Savoy Ballroom in Harlem, New York.