Green Day opened the show with their song “Last Night on Earth,” featuring a surprise appearance by Billie Eilish, and then followed up with their anthem “Still Breathing”

Billie Eilish and Finneas, Lady Gaga, Gracie Abrams, and more musicians are coming together to support those impacted by the Los Angeles wildfires and support the city the entertainment industry calls home.

Billie Eilish made a surprise appearance on stage with Green Day on Thursday to kick off one of two star-studded concerts in Los Angeles put together to raise funds for people affected by deadly wildfires in California this month.