In all honesty every self respecting dancer in New York knows that opening number. No, you don't have to know the choreography as they would teach it at the audition. However, I can pretty much guarantee you that those auditions were busting with every single person who's been on the line before.
"For me, THEATRE is an anticipation, an artistic rush, an emotional banquet, a jubilant appreciation, and an exit hopeful of clearer thought and better worlds."
~ an anonymous traveler with Robert Burns