make some bass music with javascript
Make it yours. Replace "bass music" with the genre you want; the creator followed up the same way to get pop punk.
Bass music written in JavaScript
A two-minute bass music track that Claude Opus 5.5 composed and mixed in JavaScript from one short request, shown as the running code's output. The creator says the full signal chain has 10 custom JavaScript steps.
“not a bad outcome for not having ears”
- Claude Opus 5.5
- Plain JavaScript
- One-shot
How it was made
The creator calls it one shot from the quoted request. In a reply they say the mixing makes the difference and that there are 10 custom JavaScript-driven steps in the full signal chain. They later asked Claude to turn it into pop punk, which became a single and music video.
Claude Opus 5.5 · Plain JavaScript
Source and credit
X · Sep 22, 2026 · 792 likes · 58k views · 47 comments
Authorship not stated by the source
Published instructions: Post body, in quotes
Look notesby Reference
A dark web-page player titled GROWL ENGINE: a large spectrogram of the whole track with section markers, a moving playhead, and a panel naming the current section and sound.
- Color
- Near-black page, white and peach-to-orange gradient headline, a purple-to-orange-to-yellow spectrogram, and orange level bars, with small red and yellow section labels.
- Type
- A condensed heavy sans for GROWL ENGINE and the section names (INTRO, BUILD, DROP, BREAK, OUTRO), small monospace readouts for tempo, key, bars and time, and a short sans description line.
- Framing
- 4:3 frames of one static page: the headline and description at the top, an orange Pause pill and volume slider, the full-width spectrogram strip, then a lower panel with the current section, the instrument (CHORDS, FM GROWL, LASER, METAL) and a bar meter.
- Structure
- The playhead moves left to right across the spectrogram through intro, build, drop, break, a second build, the second drop and the outro, with the section and instrument labels changing as it goes.
