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Quartet become singing musketeers

1 August 2013 Last updated at 11:15 BST

Barbershopera are an a cappella quartet with fans across the globe.

They have recently returned from five sell-out gigs in South Korea and are now bringing their take on The Three Musketeers on a tour of the UK.

Peter Sorel Cameron, Laura Darton, Harry Stone and Russell Walker, who make up Barbershopera warmed up for their time on the road with a quick BBC Breakfast sing song...