Every line of codecan become music.

CodeConcerto turns program structure into a playable score. Functions rise, loops pulse, branches shift harmony, and verified bugs interrupt the arrangement exactly where the logic breaks.

Enter the studio Hear the system

Source inLogic becomes an arrangementMusic out

Interactive composition studio

Paste the logic.
Hear the consequence.

Compose any source file, compare a Git diff, pause on a warning, resolve the finding with Codex, and export the result as editable music.

Code input

Paste code or start with an example

TypeScript

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type Order = {  id: string;  items: Array<{ price: number }>;}; declare function chargeCard(total: number): Promise<{ id: string }>;declare function saveReceipt(orderId: string, paymentId: string): Promise<void>; export async function checkout(order: Order) {  const total = order.items.reduce((sum, item) => sum + item.price, 0);  const payment = chargeCard(total);  saveReceipt(order.id, payment.id);   return { status: "paid", receipt: payment.id };}

Music style

0.0s / 15.7s

TypeScript selects the D major key · complexity 27/100 drives 93 BPM · Classical shapes the instrumentsStudio samples load on first play

Live score

CodeConcerto · typescript composition

93BPM

D majorKey

27/100Complexity

83Notes

15.7sDuration

6Tracks

MelodyFunctions, calls & returns

29 notes

AmbientComments & structure

18 notes

HarmonyConditionals & branches

3 notes

BassVariables & data

4 notes

RhythmLoops & operators

19 notes

Bug glitchPlayful off-beat failure cue

10 notes

Program structure

Fast local scan · sonify for the full parse

64/100 maintainability

1Functions

1Cyclomatic

2Max depth

12Code lines

0Classes

I V vi IVProgression

Code Review and Fix

Payment promise used before resolution

high risk · line 11

chargeCard returns before the payment has resolved, so payment.id is read from a Promise and the receipt can be saved with an undefined identifier.

What the score means

TypeScript rendered as a classical ensemble over I – V – vi – IV. Each function carries its own theme and hears it quoted back at every call site. The full program remains musical; 1 semantic risk bends the steady groove into a playful, off-beat glitch-hop stumble at the affected source line. Pause when it sounds to inspect and repair the highlighted finding.

Listen for the bugPlayful off-beat glitch-hop stumblePause when the groove breaks at line 11 to inspect the error, apply the suggested fix, and sonify again.

A bitcrushed, off-beat stumble bends the checkout motif before a brief tape-stop.

Suggested resolution

Await the payment before reading its id, then await the receipt write.

Code is not only logic on a screen. It has pace, tension, repetition, resolution, and moments that sound unmistakably wrong.

How the system listens

From source tree
to full arrangement.

CodeConcerto combines structural analysis, semantic review, musical mapping, and a production-minded playback engine in one repeatable flow.

Structure becomes score

The parser turns syntax, scope, control flow, and complexity into a multi-track arrangement with its own key and tempo.

Problems become audible

Deterministic AST analysis and contextual review merge before playback, then semantic failures bend the steady beat into a playful glitch.

Changes become direction

Diff Mode gives additions an ascending voice and removals a darker descent, turning code review into a composition you can export.

Code-to-score voices

One program.
Four musical voices.

Melodic ascent

Functions

Declarations become phrases that climb, resolve, and return with the shape of the call graph.

Rhythmic repetition

Loops

Iteration locks into percussion, making repeated work audible as tempo and pulse.

Harmonic movement

Branches

Conditionals change the chord beneath the melody so every decision has a tonal consequence.

Glitch-hop stumble

Bugs

Verified breaks bend the steady groove into a playful, syncopated stumble exactly where the source stops making sense.

Listening notes

Hear architecture before reading every line.

Dense code accelerates. Repetition locks into rhythm. Functions announce themselves as phrases rather than another metric in a dashboard.

Structural listening · 01/03

Do not just read the code.
Conduct it.

Paste a real program, choose its character, and listen for the moment the logic stops resolving.

Open the composition studio