# Claude Opus 5.5 — Karplus Strong, Tell Me How It Sounds

A 2.5-minute pop punk music video made entirely from JavaScript code that Claude wrote. It opens on a record sleeve, drops into a Claude Code terminal, then runs a lyric video in which a pixel-block singer explains that it has built a band out of math and cannot hear its own song.

- Code: TR-0021
- Kind: Teaser
- Format: Music-video style
- Brand: Claude Opus 5.5
- Length: 150.4s · 30 beats · 12 beats/min · 50 hard cuts
- Industry: AI, Music, Developer tools
- Style: Beat-synced edit, Kinetic type, Characters, Captions, Dark UI, Flat 2D, Humorous, Music-led
- Original: https://x.com/aj_dev_smith/status/2102575577563570450
- Full breakdown: https://cutmap.co/v/claude-opus-5-5-karplus-strong-tell-me-how-it-sounds

## The breakdown

The full breakdown has eleven sheets: Snapshot, Opening, Structure, Timeline, Rhythm, Look, Movement, Sound & words, Why it works, Production, Build brief. It is available to Cutmap Pro members at https://cutmap.co/v/claude-opus-5-5-karplus-strong-tell-me-how-it-sounds.