Whether it is X Factor ballads in the shower, hymns in church on a Sunday or the National Anthem before a crucial England international, everyone understands the power of singing out loud, regardless of the level of their talent. I am delighted that London is hosting this competition, giving student choirs from all over the country the opportunity to stretch their vocal chords and show off their musical flair. I wish everyone taking part the best of luck – and hope that the judges go easier on them than Simon Cowell!

Boris JohnsonFormer Mayor of London