This week's Food For Thought episode was inspired by Punch Brothers' new cover of Tony Rice's 'Church St Blues' (well, their cover of Tony's cover of Norman Blake's original!)As always with Punch Brothers and Chris Thile, opinions have been divided. Some people really take offence at a song they love being covered in a way they don't like. So I started thinking about covers in general and, in particular, the idea of whether it's actually possible to ruin a song.Have a listen and see what my take is. Then head over to Bluegrass Jamalong's Instagram or Facebook and tell me what you think!Happy picking.