"Bury a Friend" is a song by American singer-songwriter Billie Eilish and the third single from her debut studio album, When We All Fall Asleep, Where Do We Go? (2019), of which a line on the song inspired the album's title. It was released on January 30, 2019, and serviced to US alternative radio stations on February 19, 2019, through Darkroom and Interscope Records. The song was described as electronica, electropop, synth-pop, and trip hop in press reviews, for which hip-hop beats, industrial influences, percussion, and a synthesizer provide minimalist instrumentation. Within the dark and violent lyrics, Eilish sings from the perspective of a monster under someone's bed. Her vocals are subtle and treated with layers of vocal effects. Eilish wrote the song with its producer, Finneas O'Connell.