One of the most listened-to artists in the world, DJ and producer Zedd joins Ilosaarirock line up! New announcements also include Jenni Vartiainen, Paperi T, Litku Klemetti, Circle, Töölön Ketterä, PastoriPike, Ida Paul & Kalle Lindroth, Ruusut and special show by Värttinä feat. Paleface.