Released in 2019 within When We All Fall Asleep, Where Do We Go? , which debuted at #1 on the UK Albums chart. It’s eerie lyrics and instrumental make it perfect for October. But it’s amazing rise on charts and eerie sound are not why it’s a halloween choice to cover. The concept behind the song itself is creepy. Billie Eilish wrote the lyrics from the perspective of a monster under her bed. That makes the song just that much more creepy.