Final answer:
Jean-Baptiste Lully was influential in establishing court ballet, and the first female dancers appeared during his time, specifically in his ballet 'Le Triomphe de l'Amour' in 1681.
Step-by-step explanation:
The ballet by Jean-Baptiste Lully where the first female dancers appeared is not mentioned directly in the information provided. However, we can discuss the evolution of ballet and the shift towards the inclusion of female performers in dance during the time of Lully. Lully was a key figure in establishing ballet as a serious art form in France during the 17th century under the reign of Louis XIV. As for the first female dancers, they appeared on the public stage in Paris in 1681 in Lully's ballet 'Le Triomphe de l'Amour' (The Triumph of Love). Women replaced the male dancers who previously portrayed female roles, and this was a significant change in ballet's history. Lully's compositions helped shape the future of ballet by establishing court ballet as a precursor to the more formalized classical ballet that popularized the use of female dancers.