Lady Gaga had similar box office figures to Elton John - but the costs of her elaborate production, from back-up dancers to elaborate costumes and hydraulic puppets, ate into her profits significantly.

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With evident pleasure, Wiseman turns back to the choreographers and dancers, whom he photographs not in the manner of the commercial cinema, where bodies are broken up into threshing limbs, but in full frame, top to bottom, with space around them, so we can see the incredible things they are capable of as well as, inevitably, their mistakes, missteps, and gradual improvements.

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Back home, the opportunity for dancers to learn from other traditions has also recently been advanced by ABT, which this month announced an international exchange for top-tier dancers.

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With a push of a button, a curtain pulls back to reveal a stage filled with life-size dancers and musicians performing a jig.

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As I watched the second presidential debate, my mind flashed back to how Katharine Hepburn described the Hollywood partnership between dancers Fred Astaire and Ginger Rogers.

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But "Rize" -- the title derives from the "rise up" phrase in Martin Luther King's "I have a dream" speech -- goes back to the phenomenon's roots, and shows what drives the dancers to dance as they do.

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