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

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Welsh choir Côr Glanaethwy raise the roof | Semi-Final 1 | Britain's Got Talent 2015 with tags britain's got talent, britains got talent, britain's, got, talent, britains, bgt, 2015, ant and dec, ant, dec, simon cowell, david walliams, alesha dixon, amanda holden, welsh choir, cor glanaaethwy

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?