XV edition Klasz Ov The Sejtans. Interestingly, this year's edition will feature three former Polish representatives on stage at the Wacken Open Air festival. Chainsaw, present on the Polish scene since 1997, Leash Eye combining modernity with classic hard rock and metal, The Kroach from Sulejówek and Aberkane, who are inspired by the alternative sound of America in the 90s, will perform.