As part of Radio 3's Breaking Free: Martin Luther's Revolution, The Listening Service asks where the idea of communal singing, especially in religious contexts, came from in modern Europe. It seems natural to us today but the practice of congregational singing was once a radical, revolutionary idea that brought religion and politics together. And - what do the football chants heard on the terraces share with the hymns we sing in church? Tom talks to Bach scholar John Butt and the Reverend Lucy Winkett to find some answers. Rethink music with The Listening Service.