Long treated as a final flourish, sound design is now sitting at the heart of theatre productions – and new technology means it can make drama more tense and terrifying than ever before Yael Farber’s remarkable production of Lorraine Hansberry’s Les Blancs finishes its run at the National Theatre on Thursday. You should try to catch it. It’s a galvanising evening conjuring a colonised Africa on the brink of revolution, which celebrates its cultural wealth and ancient traditions. One of the significant elements is the music and sound – as Susannah Clapp quite rightly observed, you leave with your ears ringing.

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