Visit the official site: http://itv.com/xfactor
With the cast of Mamma Mia: Here We Go Again and ABBA legend Bjorn in the audience, the Semi-Finalists put on a memorable performance on the X Factor stage.
SUBSCRIBE: http://bit.ly/TXFSub
Facebook: http://bit.ly/TXFFB
Twitter: http://bit.ly/TXFTwi
Download The X Factor mobile app: http://bit.ly/TXFapp
Watch full episodes on ITV Hub (UK ONLY): http://www.itv.com/hub/the-x-factor