"37 Ghosts" is a hidden track of 2008's Ghosts I–IV, found exclusively in the Multitrack DVD in the Deluxe Edition, alongside "38 Ghosts". The track has not been released as a song, instead being only officially available in multitrack form for listeners to put together themselves. It contains atmospheric and noisy synth sounds. It should also be noted that no official artwork is available for the bonus tracks.
- Ghosts I–IV (Multitrack DVD)
This is the only known version. The song has an overall unsettling atmosphere, featuring lots of noise and dissonant synthesizers. Vocal pads and other synths begin the song. Noise fades in, cuts abruptly leaving other sound effects. The song ends with an echoing synth.
"37 Ghosts" has never been played live.
- Archive.org Download of "37 Ghosts" + "38 Ghosts" (CC BY-NC-SA 3.0)