Jatnna Nuñez for Fuse

Last week, Oh Wonder had a gig DJing for hungover campers taking $10 showers at Bonnaroo.

This week, Firefly gave the British pop duo a proper festival gig, putting them on stage at the Delaware festival for the first time.

“We started writing songs in my parents’ garden a year and a half ago. We never thought we'd tour,” shouted Josephine Vander Gucht during the band's Thursday set, wearing a Piet Mondrian-inspired geometric dress.

In reality, Josephine and bandmate Anthony West have been writing electronic-tinged folk pop songs together for many years, but in the moment, with thousands of muddy, sparkly music lovers in front of her, it might’ve been easy to get caught up in the whirlwind that has been Oh Wonder’s come-up.

Jatnna Nuñez for Fuse

In September of 2014, the two decided to put out one song a month for a year—doing all the writing, mixing and producing—giving themselves solid deadlines to adhere to. But what was a rigid schedule for them became a journey for fans, who caught on faster and faster each month and started to anticipate the next song. What started as a completely indie endeavor became much larger. Josephine and Andrew now have their debut self-titled album out, and are signed to Republic Records.

Some bands’ early-days festival sets include singing to 10 people sitting on yellowed grass at noon, but despite having a time slot on Thursday before the majority of Firefly guests arrive for the weekend, everyone came out for the Oh Wonder set. Fans, crowded hundreds of feet deep, carried Oh Wonder signs and sang along to songs like “Lose It,” “Drive” and “Without You," reciting every word. Not too bad for one of their first festival sets ever.

Jatnna Nuñez for Fuse

They’ll be opening for Halsey on her Badlands Tour in the upcoming months. And they’ve got a set at Lollapalooza on July 31. I have a feeling they won’t have to DJ for naked people rubbing mud off their bodies ever again.

Check out more pictures from Firefly below: