Tomorrowland Weekend 1 is officially underway, and it has already delivered one of those rare, historic festival moments that people will be talking about for years. During his headlining set on Friday night, Dutch superstar Martin Garrix shocked a crowd of 90,000 fans by bringing out rock royalty—The Edge from U2—to premiere an unreleased collaborative anthem titled “Fireflies”.
If you weren’t on the live stream, here is what went down during the most electric crossover of the weekend.
When EDM Royalty Meets Rock Legends
This isn’t the first time Garrix has teamed up with the iconic Irish rock band; they previously joined forces for the UEFA Euro 2020 official anthem, “We Are The People”. However, witnessing the legendary guitarist step onto the Tomorrowland Mainstage took the energy to an entirely new level.
The track blends Garrix’s signature progressive house euphoria with the unmistakable, shimmering guitar delay and arena-sized melodies that define U2’s legendary sound.
A Peek at the Lyrics of “Fireflies”:
“Cause you and I are fireflies… / Forgetting that the sun will rise. / I’ll meet you in the air tonight. / Fireflies.”The Breakdown: What We Know So Far
Factor Detail Track Title “Fireflies” (ID) Artists Martin Garrix & U2 (featuring The Edge live) Premiered July 17, 2026 at Tomorrowland Mainstage (Boom, Belgium) Sound Profile Melodic Progressive House mixed with classic Arena Rock textures Expected Release Rumored to drop on STMPD RCRDS as early as next week
As the crowd illuminated the night sky with their phones, it genuinely looked like a field of fireflies. The emotional weight of the vocal, layered over The Edge’s live guitar work and Garrix’s swelling synthesizers, created an absolute masterpiece of an outro.
What’s Next?
Garrix has been on an absolute tear with unreleased music lately, but “Fireflies” easily stands out as a historic centerpiece. Fans are already ripping the audio from the official Tomorrowland stream, and the hype across Reddit and social media is exploding.Keep your eyes on Garrix’s socials, because a track this massive won’t stay unreleased for long. If this is just Day 1 of Tomorrowland, we are in for a legendary couple of weekends.
