Kant holds that the fundamental principle of our moral duties is a categorical imperative. For people who listen to Heavy Metal, that means categorising music with the most awesome array of sub-categories you can imagine!Rod tells Will (and Hans!) all about the science of Heavy Metal!The Wholesome Show is Rod Lamberts and Will Grant, joined today by Hans Thulstrup! Proudly brought to you by The Australian National Centre for the Public Awareness of Science!See omnystudio.com/listener for privacy information.