What do the best Scottish chips have in common with the best songwriters? KT Tunstall explains as we travel to Edinburgh to hear music from KT's new album Wax. KT shares stories from her childhood, including the magical game her physicist father would play with her and her brother when they were kids. It involved liquid nitrogen and a long corridor, and was called "Don't Touch, Don't Die". She describes what it was like the first time her brother, who is deaf, was able to hear her music thanks to a cochlear implant. And KT shares her theory on why Scotland has such a massive musical output for a country with a relatively small population.