Q: Take the name of a famous musical. Write it in upper- and lowercase letters, as you usually would. Now turn one of the characters upside-down and move it to another place in the title. The result will be the last name of a well-known stage performer. What is the musical, and who is the performer?
Chicago? Nope. Cats? Nope. Hmm... I'm not getting it!
Edit: My hint had question marks, an ellipsis and an exclamation point to point you to thinking about the punctuation.