For their part, Twenty One Pilots surprised the world with the release of “Blurryface” (2015), an album that sold a whopping 7 million copies and earned the duo their first Grammy award. Three years later, Tyler Joseph and Josh Dun would be in the spotlight again with the release of “Trench” (2018), which established them as one of the greatest bands in the world. Mad Cool Festival will provide the only opportunity to see them in Spain in 2020.