Olivia Rodrigo delivered alongside surprising guests Weezer as Lollapalooza continued in Chicago with performances by T-Pain, Flipturn, Gigi Perez, Bo Staloch and more.

Olivia Rodrigo and Korn will provide contrasting styles Friday evening as Lollapalooza heads into the weekend. Djo, Ravyn Lenae, T-Pain and Bleachers are also set to take the stage Friday.

Olivia Rodrigo rocked the Lollapalooza crowd by bringing out a special guest during her headlining set at the music festival. Weezer joined Rodrigo on stage Friday during her debut headlining set. Rodrigo and Weezer’s Rivers Cuomo duetted on two iconic Weezer hits: “Say It Aint So” and “Buddy Holly.”