See more from Britains Got Talent at The 160-plus-piece choir from Wales had the audience and the Judges enthralled with their .\rbr\rbrThe 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 .\rbr\rbrHallelujah! Its Côr Glanaethwy. The 165-piece Welsh choir brought the house down with their rousing semi-final performance. Could their magnificent rendition .\rbr\rbrSee more from Britains Got Talent at The 165-piece Welsh choir brought the house down with their rousing semi-final performance.