Watch Billie Eilish Perform Intimate Acoustic Set at Amoeba Music

Billie Eilish hosted a surprise gig at Hollywood Amoeba

Music to celebrate the one-year anniversary of the release of her second album,

The Grammy Award-winning singer played guitar with his brother

The Irish performed four songs at lunchtime: "Billy Bossanova

Between the songs, the Irish addressed the crowd.

“You have had your best year and your best year.