Eighteen-year-old Billie Eilish is now one of the biggest pop stars in the world. On tour, her brother is often onstage with her, singing back up or playing the guitar or piano for her performances. O ...

Billie Eilish had set herself up as an intriguing pop artist destined for success with early singles like “Ocean Eyes,” “You Should See Me in a Crown,” “Bury a Friend” and others, but “Bad Guy” took ...