Hidden Images in Music: The Secret Art of Spectrograms
A spectrogram is a visual display of audio frequencies over time. Some musicians and sound designers deliberately encode images into their audio - pictures that are invisible to the ear but appear when you view the audio file in a spectrogram analyzer like Audacity or Spek.
This technique has been used by electronic musicians, game developers, and ARG creators to hide easter eggs, logos, and secret messages inside sound. Here are 10 of the most iconic examples.
1. Aphex Twin - "ΔMi−1" (Windowlicker EP)
The most famous spectrogram image in music history. The final track on the 1999 Windowlicker EP contains Richard D. James's grinning face, visible when the audio is viewed as a spectrogram. This is the image that introduced most people to the concept of spectrogram art and remains the definitive example of the technique.
2. Aphex Twin - "Equation" (Windowlicker EP)
Another track from the same EP contains a second hidden image - a spiral pattern that has been interpreted as a mathematical equation. Aphex Twin used custom software developed by his collaborator to encode these images.
3. Nine Inch Nails - "My Violent Heart" (Year Zero)
Trent Reznor embedded spectrogram images throughout the Year Zero album as part of an elaborate alternate reality game (ARG). Fans discovered hidden images by analyzing the audio, which led them to websites and phone numbers that expanded the dystopian narrative. The spectrogram images included static-like patterns containing encoded messages.
4. DOOM (2016) - Soundtrack Pentagrams
Composer Mick Gordon embedded pentagrams and the number 666 into the DOOM (2016) soundtrack. When certain tracks are viewed in a spectrogram analyzer, satanic imagery appears - perfectly on-brand for a game about killing demons in Hell.
5. Venetian Snares - "Look" (Songs About My Cats)
Aaron Funk embedded photos of his cats into the spectrogram of this track from the 2001 album. The images of his actual pet cats appear when the audio is analyzed, making this one of the more wholesome uses of the technique.
6. Boards of Canada - Various Tracks
The Scottish electronic duo has hidden numbers, symbols, and cryptic messages in spectrograms across multiple albums. Their fans have spent years analyzing every release for hidden content, and Boards of Canada have confirmed the practice in interviews.
7. Mick Gordon - DOOM Eternal
Building on the 2016 DOOM soundtrack, Mick Gordon continued embedding imagery in DOOM Eternal. The 2020 soundtrack contains additional hidden visuals including demonic symbols and game-related imagery visible only through spectrogram analysis.
8. Disasterpeace - FEZ Soundtrack
The indie game FEZ by Phil Fish featured a soundtrack by Disasterpeace that contained spectrogram puzzles. Players had to decode hidden images in the audio to solve in-game puzzles - making the spectrogram technique an actual gameplay mechanic.
9. Burial - "Archangel" and Other Tracks
The enigmatic UK producer Burial has been found to have subtle visual patterns in his spectrograms, though debate continues about whether these are intentional art or artifacts of his production technique. The mystery suits his anonymous persona perfectly.
10. Tool - 10,000 Days
Progressive metal band Tool included spectrogram content in their 10,000 Days album packaging. The band's interest in sacred geometry and hidden meanings extends into the audio domain, with fans discovering geometric patterns in spectrogram analyses of certain tracks.
How to View Hidden Spectrogram Images
Want to check your favorite music for hidden images? Here's how:
- Get a spectrogram viewer - Audacity (free) or Spek (free) both work
- Open the audio file - WAV or FLAC gives the best results; MP3 compression can blur images
- Switch to spectrogram view - In Audacity: click the track dropdown → Spectrogram
- Adjust the frequency range - Zoom into different frequency bands; some images are hidden in specific ranges
Create Your Own Spectrogram Art
Inspired by Aphex Twin and DOOM? You can embed your own images into audio with Img2Sound. Upload any image, choose your frequency range, and get a WAV file with your picture hidden inside. Try it free - 3 credits on signup, no credit card required.