BBC Two continues its exploration of the songwriting process, with the second episode of the series focusing on the Breakthrough Single. This week, songwriter, producer and musician Guy Chambers joins forces with pop maestro Mark Ronson and emerging young singer Tawiah to write the elusive breakthough single. With unprecedented access, the programme follows the trio through the whole process, starting from pen to paper, to the studio recording stage, finishing with the first public performance. The programme also hears from a variety of celebrated musical contributors who divulge the secrets of the trade, including professional songwriter Brian Higgins and contemporary pop phenomenon Jessie J. If you can't quite pinpoint the voice of the narrator, it's Stephen 'Donkey' Mangan.