Watch the nail-biting result of the first semi-final | Semi-Final 1 | Britain's Got Talent 2015

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Watch the nail-biting result of the first semi-final | 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, henry gallagher, welsh choir, entity allstars, dance, dance group

And then there were three - Côr Glanaethwy, Entity Allstars and Henry Gallagher.

See the moment the finalists were announced.