Beverley Knight and James Morrison select their all-time favourite vocalists in a playlist packed with some of the world's greatest singers. They celebrate incredible voices and track their influence in an hour of astonishing archive performances. James picks Tina Turner's epic Proud Mary rendition as one of his all-time greats, and Beverley introduces him to Big Mama Thornton - a woman who taught Elvis a thing a two. What's it like to sing with your 'idol of idols'? Beverley reveals how she felt when this opportunity presented itself. Experience the raw stadium rock vocal of Steve Tyler and the soaring acoustic purity of Eva Cassidy; the intensity of Otis Redding and the passion of Prince. Whitney Houston sings live to an audience of millions, and Sir Tom Jones returns to the green grass of Wales to deliver one of his classic hits. Finally a pitch-perfect George Michael serves to blow the roof off Wembley stadium in this feelgood hour of dazzling show-stoppers.