Welsh choir Côr Glanaethwy raise the roof | Semi-Final 1 | Britain's Got Talent 2015

See more from Britain’s Got Talent at http://itv.com/talent

The 160-plus-piece choir from Wales had the audience and the Judges enthralled with their mesmerising audition.

But will their semi-final performance be the answer to their prayers? 

See more from Britain’s Got Talent at http://itv.com/talent

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