text:  Coming up on Outlook on the BBC World Service with me, Mubeen Azhar. Martin Kanja is a Kenyan metal musician who's very happy to answer the question, what is a death growl? It's like when you sigh, like at the end of the sigh, but not just hold it and you push it from the diaphragm. You can shape it in different things. You can do inhales. Inhales.