And Mad Cool Festival will also be the appointment of the year with the Spanish public for Alt-J. The British trio formed by Joe Newman, Gus Unger-Hamilton and Thom Green will once again make the Madrid public vibrate as they did, precisely three years ago, at Mad Cool. With three albums to their credit - "An Awesome Wave" (2012), "This Is All Yours" (2014) and "RELAXER" (2017), the group has earned the respect of critics and legions of fans alike with their unique sound.