”An arrhythmia describes an irregular heartbeat – the heart may beat too fast, too slowly, too early, or irregularly.” This is what Medical News Today says about arrhythmia, the English translation of Rytmihäiriö, the name of this Finnish group from Helsinki. To know just how this fits the band’s music, you had better see them live. What we can tell you right now is that their range of musical output varies from hardcore punk and death metal to heavier grindcore.