LE SSERAFIM Becomes First K-pop Girl Group to Headline iHeartRadio Festival

LE SSERAFIM's full iHeartRadio Music Festival 2026 show.

LE SSERAFIM just made K-pop history. On Saturday, September 19, they became the first K-pop girl group to ever headline the main stage at the iHeartRadio Music Festival, playing T-Mobile Arena in Las Vegas one night after BTS closed out Friday. Here's a quick recap of the festival, their biggest song, and the full setlist, ranked by how popular each song actually is.

The Festival, Quickly

The 2026 iHeartRadio Music Festival, presented by Capital One, ran two nights at T-Mobile Arena in Las Vegas: Friday, September 18, and Saturday, September 19. Ryan Seacrest hosted both nights, and the whole thing streamed live on Disney+ and Hulu.

Friday's lineup was led by BTS, along with Cardi B, Kenny Chesney, Weezer, Goo Goo Dolls, and Zara Larsson. Saturday's lineup was led by LE SSERAFIM, along with Benson Boone, Muse, Snoop Dogg, Major Lazer, and Lainey Wilson.

Two-day passes sold out on AXS before the festival even started, and T-Mobile Arena holds up to 20,000 people a night.

A First for K-pop Girl Groups

LE SSERAFIM is the first K-pop girl group to ever play the iHeartRadio Music Festival's main stage. Going on one night after BTS also made this the first time the festival has had K-pop headliners on back-to-back nights.

Their #1 Song: "CRAZY"

Their biggest song by far is "CRAZY," with over 500 million streams on Spotify — more than anything else in their catalog. It's fast, a little unhinged, and built for exactly the kind of big festival crowd they played to on Saturday.

LE SSERAFIM's official music video for "CRAZY," their most-streamed song ever.

Their Setlist, Ranked by Popularity

Here's what LE SSERAFIM played on Saturday, ranked from their most-streamed song down to their least:

• 1. "CRAZY" — 500M+ streams. Their biggest hit ever, and it closed out the set.
• 2. "Spaghetti" (feat. j-hope of BTS) — 300M+ streams. A fitting one to play the night after BTS, since j-hope is actually featured on the track.
• 3. "Iconic By Mistake" — 190M+ streams. One of the standout tracks off their 2026 album, Pureflow, Pt. 1.
• 4. "Boompala" — 85M+ streams. A Latin house track that samples the classic song "Macarena."
• 5. "Saki" (feat. Aliyah's Interlude) — one of the newer songs off Pureflow, Pt. 1.
• 6. "Made My Night" — their newest single, and the opener for the set.

LE SSERAFIM On the Rise

• The BTS connection runs deeper than the schedule. LE SSERAFIM's Huh Yunjin appeared on j-hope's 2024 solo album, and j-hope returned the favor by featuring on LE SSERAFIM's "Spaghetti." Playing back-to-back nights at the same festival only added to it, and a photo of the two groups together went viral on Korean fan forums, with fans saying they hope LE SSERAFIM gets as big as BTS worldwide.
• 2026 has been a breakout year for the group globally. Before this show, they'd already played Japan's Summer Sonic festival, appeared at BlizzCon, performed at Dick Clark's New Year's Rockin' Eve in Times Square, and made multiple appearances on The Jennifer Hudson Show — all signs of how fast their reach has grown outside Korea.

Vibe Along

Listen to LE SSERAFIM's hits and tap one of these to jump into the app with that particle already going.

• Vortex — a fast, spinning particle tunnel built for a song as high-energy as "CRAZY."
• Galaxy — a huge, cinematic particle field that matches a packed 20,000-person arena.
• City — a neon night scene that matches the Vegas Strip outside the arena.