A three-day festival that has been a staple of the Vienna calendar since 2019, Frequency returns with a stellar line-up in 2019. Who is on tap? Well, there’s Twenty One Pilots, Swedish House Mafia, Macklemore, The Offspring, Billie Eilish, Less Than Jake and a whole lot more. The full line-up is available at the official website, along with ticket information and plenty more.