There’s a concept in Scandinavian society called the Law of Jante, which says individuals should downplay their achievements, blend in and support the group. The music of Danish band Yung serves as an urgent, screaming retort to that idea, the sound of young iconoclasts fighting against apathy. Led by 21-year-old frontman and songwriter Mikkel Holm Silkjær, the group hails from Aarhus, Denmark’s second city, a huge port, university town and ideal place to find like minds amid the industrial grit. On the forthcoming EP “These Thoughts Are Mandatory Chores,” they show themselves to be ambassadors of their country’s increasingly vital underground music scene. Anthemic guitars, coarse feedback and driving rhythm, insistent to the point of impatience, show angst acting as a powerful fuel for self-expression, gasoline poured on a fire already fed by youthful energy.