"Empty" will appear on Barrie's 5K EP with "Races", "Unholy Appetite" and "Nocturne Interlude", and is, inn Barrie's own words, about "me reflecting on and getting angry about how so many of my thoughts aren’t my own; it’s a hazy mix of taste and ideas printed on my brain by my culture, my upbringing, people around me while in any impressionable age."

Barrie adds, "I’ve been trying to take back ownership of my thoughts, and access what I actually think and feel. I have to take responsibility for the things inside my head. The song started with the line "there is no act to private / that I don't want you to like it," which encapsulates the sentiment. It didn't end up fitting in the song, but that kind of constant confusion of your own thoughts with other people's thoughts is at the heart of it."

5K is made up of songs that were recorded during her Barbara album sessions, but didn't fit the final record.