Britain's Got Talent semi-finalists, Band of Voices, perform Katy Perry's "Roar" during their interview with iSing Magazine. Read the full article: http://www.isingmag.com/the-backing-vocalist/ iSing Magazine is a free magazine dedicated to singers and singing. Sign up now to get iSing Magazine free to your in-box: http://bit.ly/MyDose Come hang with the tribe! Facebook: https://www.facebook.com/isingmag Instagram: https://www.instagram.com/isingmag Twitter: https://twitter.com/isingmag Website: http://www.isingmag.com