What is it about singing that can make people feel good?

It's a question that's been posed in a profound way in Liverpool where a choir has been set up to help its members overcome life-long problems and it's made of up of people recovering from serious drug and alcohol addiction.

They're called the Raucous Caucus Recovery Chorus and they are soon to be visited by the Duchess of Cambridge, who's a patron of the charity that runs the group.

Tom Bateman's been along to hear them in action.

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