Comedian and actor Billy Crystal also shared a moving story about the loss of the home he's lived in with his family for 46 years, and the power of laughter was a method of perseverance. Green Day opened up the benefit concert and were quickly joined by Eilish for a performance of the band's "Last Night on Earth" from their 2009 album "21st Century Breakdown.

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.

The first of two concerts collectively being referred to as FireAid kicked off at the Kia Forum 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, claiming 29 lives and causing billions of dollars in damage.