Those famous words “Boop-Oop-A-Doop” that are so famously associated with Betty Boop, were first sung on stage in the Cotton Club by a jazz singer named Baby Esther. The "Betty Boop" cartoon character was the subject of a lawsuit by the popular singer Helen Kane, who claimed her singing style had been ripped off. Baby Esther’s performance in a some old footage was shown against Helen Kane in trial(1934) which cause Helen Kane to lose her claim against the Fleischer Studios.
