Audiences tuning into the FireAid benefit concert for Los Angeles on Thursday night (Jan. 30) were surprised with an early treat when pop superstar Billie Eilish made a surprise appearance alongside Billie Joe Armstrong and the rest of Green Day for a stirring opening performance.

Two concerts collectively referred to as FireAid kicked off at the Kia Forum and the Intuit Dome in the Los Angeles city of Inglewood to support relief efforts in the wake of the deadly wildfires that ignited earlier this month in the LA area,

Eilish departed after one song, leaving Green Day to rock through two more tunes. “Los Angeles, we are still alive. This is California and we’re all in this together,” frontman Billie Joe Armstrong declared before launching into “Still Breathing.” Green Day closed their three-song set with a rendition of their classic hit “When I Come Around.”