"4th Unknown Song" is a currently unreleased song by Billie Eilish. She teased it by posting a snippet on her Instagram story in May of 2018. A short snippet of the song was performed during the Billie Eilish: The World's a Little Blurry documentary. It is possible that the song will be included on her upcoming sophmore album.
|List of Unreleased Songs|
|Partially Leaked Songs|