Today, July 8, Madrid's Mad Cool Festival revealed the first-wave lineup for their postponed fifth anniversary event. The headliners for the four-day fest, taking place July 7-10, 2021, are GRAMMY winners Red Hot Chili Peppers, Twenty One Pilots, Mumford & Sons, Deftones, GRAMMY nominees the Killers and Faith No More, and Pixies, Placebo and Royal Blood.

GRAMMY nominees Carly Rae Jepsen, Black Pumas, Fever 333, Alt-J, as well as The Rapture, Puscifer, Angel Olsen and Waxahatchee are also among the 94 acts making up the initial lineup. Mad Cool notes that 132 total will make up the final billing, which includes three more headliners, and will be shared "as soon as possible."

Meet The First-Time GRAMMY Nominee: Black Pumas On Their Breakout Year, Creative Process And "New Chapter"

Other artists playing the big 2021 event include London Grammar, Yungblud, Foals, Pale Waves, Alec Benjamin, Glass Animals and Shura. The fest's electronic music stage, The Loop, also reveals a solid offering: GRAMMY winner Diplo and his  Major Lazer project, GRAMMY nominees Four Tet, RÜFÜS DU SOL, along with electro heavyweights Floating Points, Octa Octa, Nina Kraviz, Hayden James, Modeselektor, ANNA and more.

Since the event was officially rescheduled to 2021 on June 26, organizers have been working to book as many of the artists from the original 2020 announcement, although headliner Taylor Swift will not be able to play the 2021 edition.

"You have asked a lot about Taylor Swift, unfortunately we are sad to tell you that she won't be able to attend our next edition. We have been working with her agent & management to try to make it happen for our 5th anniversary, but it hasn't been possible. Hopefully we will have her in one of our future editions," today's statement reads.

Listen: Shea Diamond, Tom Morello, Dan Reynolds & The Bloody Beetroots Call Listeners To Action In "Stand Up"

Tickets for Mad Cool 2021 went on sale today, starting at €75 for single-day tickets. 2020 ticket holders have until the next lineup announcement to request refunds; those who decide to keep their tickets get 25 percent off of merch and tickets to the Mad Cool Vibra Mahou tour. Please visit Mad Cool's website for more info on tickets and the lineup.

Yvonne Orji On Her First-Ever HBO Comedy Special, Faith & Celebrating Black Joy