Sabrina Carpenter shocked fans at Lollapalooza Chicago on Sunday by bringing out Earth, Wind and Fire for a surprise mashup of “Let’s Groove” and “September.” The legendary band joined her onstage mid-set, delivering an unforgettable fusion of funk and pop. Social media instantly erupted, with fans calling the moment “electric” and “pure joy.”

The performance follows her recent duet with Duran Duran in London. Sabrina also added humor to the night by “arresting” members TWICE during her Juno intro.