Alan Yentob investigates the emotional power of music, an art form that people turn to when words are not enough, at funerals and weddings, at times of heartbreak or great euphoria. He talks to singers and composers as varied as chart star Emeli Sande, opera diva Jessye Norman, dub-step artist Mala and classical maestro George Benjamin to find out how music makes people feel and why, as well as a vicar, a psychologist, an ad man and even the people who choose the songs to play in shopping centres. Along the way he sees babies dance to a rhythm and elderly people brought out of their silence by a melody.