Revelation Avenue roar straight into the semi-finals! | Britain's Got Talent 2015

See more from Britain's Got Talent at http://itv.com/talent Think you know gospel? You haven't heard Revelation Avenue! This 12-piece choir from East London bring the house down with their rousing rendition of Roar by Katy Perry, bagging themselves a spot in the live shows when Amanda presses the golden buzzer. SUBSCRIBE: http://bit.ly/BGTsub Facebook: http://www.facebook.com/BGT Twitter: http://twitter.com/BGT