More opportunities for outrage at 9.00pm tonight on BBC Radio 2.

In this third episode Seth focuses on Wales, the land of song. He hears from Welsh harpist Catrin Finch, singer-songwriter Martyn Joseph, folk singer Gwilym Bowen Rhys, Iolo Whelan of Pendevig, fiddle player Oliver Wilson Dickson, singer Gwyneth Glyn, and five-piece band Calan.