Here's a tiny, pre-Tony Lea Salonga auditioning in front of powerhouse Cameron Mackintosh for Miss Saigon.
The documentary Every Little Step explores the making of A Chorus Line--the ultimate depiction of the open casting call, and just how painful it can be. The film, which came out earlier this year, also includes clips from the audition process for the most recent Broadway revival. Notice the tear-your-heart-out line at the :24 mark: "If you've been cut, can you please...get out." Ouch.