Uproar, disruption, violent dispute – this was the response to the much-anticipated centenary of the Bayreuth Festival in 1976, which presented a new production of Richard Wagner’s Der Ring des Nibelungen. But before Pierre Boulez could step up to the conductor’s podium and the curtain could rise on Bayreuth’s Green Hill for Patrice Chéreau’s bold new production, the festival was rocked by artistic and political upheaval. The film tells how one of the greatest scandals in opera went on to become one of the greatest musical moments in history.