Special, never-before-seen documentary footage of Minnelli rehearsing for the show, in her old stomping ground of Studio 54, has recently been released, courtesy of Sondheim on Sondheim star Leslie Kritzer (who plays Liza here).  Her fellow cast mates Erin Mackey and Euan Morton also appear, as does the show's musical director, Andy Einhorn, and the theatre security guard, Ralph Mohan.

To catch a glimpse of what might have been for Sondheim on Sondheim look below:

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