Mad Cool festival returns to Madrid, Spain from July 8-11, 2026, featuring a powerhouse lineup of rock, pop, alternative, and electronic artists across four days. Headliners include legendary acts Foo Fighters, Florence & The Machine, Nick Cave & The Bad Seeds, and David Byrne alongside contemporary stars like Lorde, Twenty One Pilots, and Halsey. The festival showcases both iconic bands such as Pulp, Pixies, and Kings of Leon, plus rising talents like Teddy Swims and Wolf Alice, creating a diverse musical experience spanning multiple generations. With 70 artists representing 11 countries including the UK, US, France, Sweden, Germany, New Zealand, and South Korea, Mad Cool offers an internationally diverse celebration of modern music across rock, pop, alternative, electronic, and techno genres.