Producers, The (2005) Easter Egg - Audition Scene Opening

At the very beginning of the audition for the part of Hitler, we hear a familiar six-note melody and the word "Again!" This is a reference "A Chorus Line", which takes place at a dancer's audition and begins the same way.
Yes, this egg was in the stage show, but seeing as how eeggs.com doesn't even HAVE a Broadway section...