The incredible choreography of La La Land

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"I count to eight. Musicians count to four. Stunt performers don't count." Katie Derham interviews the award-winning choreographer Mandy Moore about her work on La La Land: director Damien Chazelle's love letter to the golden days of the Hollywood musical. This is a clip from a longer show devoted to dance on screen - hear more on BBC Sounds by searching for Sound of Dance.