Sean Fletcher explores the power of singing to express the Christian faith and to change people's lives for the better. He meets music historian and choir conductor Dr Andrew Gant and attends the True Worship Summit - an international conference celebrating gospel music - and joins hundreds of singers from all over Europe to take part in singing workshops led by some of the biggest names in gospel. Strictly finalist Alexandra Burke opens her heart about her Christian faith and how her late mother inspired her to sing and perform. And the Rev Kate Bottley meets The Missing People Choir - a singing group that brings together people who all have loved ones who disappeared. Kate speaks to Peter Boxell, whose son Lee went missing in 1988, and to Peter Lawrence, whose daughter Claudia disappeared in York in 2009. They tell Kate how the choir helps them cope and about reaching the final of Britain's Got Talent last year - which led directly to some families being reunited.