People have claimed that listening to heavy metal, because of its aggressive sonic palette and often violent or emotionally negative lyrics, leads to angry and aggressive behaviour (Selfhout et al., 2008). As a very non-violent metal fan this accusation bugs me. Imagine I designed a study to test this possibility. I took groups of self-classifying metalheads and non-metalheads (fan) and assigned them randomly to listen to 15 minutes of either the sound of an angle grinder scraping a sheet of metal (control noise), metal music or pop music (soundtrack). Each person rated their anger on a scale ranging from 0 (‘All you need is love, da, da, da-da-da’) to 100 (‘All you wanna do is drag me down, all I wanna do is stamp you out’). Fit a model to test my idea (metal.sav).