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Madonna Joined Onstage by Son Rocco at "secretprojectrevolution" Launch on Tuesday officially debuted her much-discussed secretprojectrevolution film, with a little help from her 13-year-old son, Rocco.

At the New York City event, Madonna delivered a haunting performance of "Between the Bars," a song by the late singer-songwriter Elliott Smith, that featured Rocco.

It began with Madonna being dragged onto the stage by a couple of "police officers."  Her left hand was handcuffed behind her back to her right hand, which was holding a microphone on the side of her body.

Halfway through the performance, footage of which has been posted on YouTube, a mysterious person dressed in black from head to toe uncuffed the left hand.  In the end, the person was revealed to be Rocco.

It all calls to mind the dark series of trailers Madonna released over the summer for secretprojectrevolution, a 17-minute film on which she worked with photographer Steven Klein in conjunction with their Art for Freedom campaign.  The campaign "encourages the world to express their personal meaning of freedom and revolution in the form of video, music, poetry, and photography."

In addressing the crowd at Tuesday night's event, Madonna called the film the "most important thing" she's ever done as an artist.  You can watch the flick on YouTube via, which also offers a BitTorrent link to the project.

Madonna also has released a Flipboard magazine inspired by and named after the Art For Freedom campaign.  Download the free Flipboard mobile app to check it out.

According to Billboard, celebrity guests at the secretprojectrevolution launch included Madonna's ex-husband Sean Penn, Lindsay Lohan, Anderson Cooper and Elementary actress Lucy Liu.

Copyright 2013 ABC News Radio

ABC News Radio