What happens when the show can’t go on? It does. In the case of “Wicked,” when Glinda or Dr. Dillamond goes on vacation, it’s the understudies, standbys and swings’ job to step in and not miss a beat. We go backstage to meet one of the unheralded heroes of “Wicked” Swing Extraordinaire Brian Munn in this all access edition of Working In The Theatre.  (2014)