Mad Cool Festival has announced the initial lineup for its sixth edition, which will take place in Madrid from July 6 to 8 next year. Red Hot Chili Peppers, Liam Gallagher, The Prodigy, The Black Keys, Lizzo, Queens of the Stone Age, Sam Smith, the 1975, Robbie Williams, and Lil Nas X are among the headliners, with Franz Ferdinand, Tash Sultana, Paolo Nutini, Jamie XX, Machine Gun Kelly, Sigur Rós, Angel Olsen, Years & Years, Men I Trust, Nathaniel Rateliff & The Night Sweats, Jacob Collier, Touché Amoré, The Blessed Madonna, Honey Dijon, Genesis Owusu, Rina Sawayama, Bombay Bicycle Club, Sylvan Esso, and more also set to perform. More names will be announced at later date. Check out the first wave of acts below.