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Procedural music engine Played by ear

A deterministic music engine you play by ear.

Septet is a band of seven players you tune like a studio rack. Every control's colour tells you which musical question it answers — turn the knobs, throw the switches, and keep the seed of any tune you like. The same seed always makes the same tune.

Start the studio Power on the rack no account needed to listen · seed 0x1A
Throw power — the rack boots screen by screen.
Tempo120BPM KeyD MAJ Seed7C·4F·A1
STRUCTURESEPTET AUDIO · SA-20
0x3C
Song
FormAABA
Len8 BARS
Tempo120.0 BPM
CHORDSSEPTET AUDIO · SA-21 · key D
0x55
Harmony
KeyD MAJOR
ChordA7 · V
NextDmaj7 · I
DRUMSSEPTET AUDIO · SA-30
0x77
Groove
Kit808 · DRY
FeelSWUNG 30%
Busy66 / 100
MELODYSEPTET AUDIO · SA-44
0x9E
Melody
RangeD4–A5
ShapeARCH
PhraseCALL · 4
The band

Seven players. One graph. Each a colour.

Every player carries one musical concern, and its signature colour is that concern. Squint and the rack reads as families; focus and you read the exact voice.

Motif motif

The ur-material — one short cell every other player can quote.

Structure structure

The song's form and arc — AABA, the builds, the cadence that lands.

Chords harmony

Key, scale, and the chord changes every other player reads.

Drums intensity

The kit and the drive — the energy and push the whole band rides.

Bass call-response

Walks the changes — a line of its own, trading call and answer over the chords.

Arp density

The busy voice — arpeggios threading the harmony.

Melody contour

The lead line — its shape, its question-and-answer.

Why it sounds good

Thousands of tunes that actually sound good.

Not noise with a random button — a band that listens to itself. Every tune is one seed; the same seed always makes the same tune, so the ones you like are yours to keep.

7Players in the bandone graph, seven voices
0x1ASeed per tunekeep the ones you like
100%Deterministicsame seed · same tune
10Facet concernsthe colour language
Pricing

Start free. Keep what you make.

Generation is unlimited on every plan — you pay to keep more seeds and to render to the SID and NES engines. See the full sheet →

Plans billed monthly · cancel anytime
Bedroom $0/mo
  • Unlimited generation
  • Keep 25 seeds
  • SID + NES render
Start free
Label $29/mo
  • Everything in Studio
  • Stem & MIDI export
  • Five seats
Choose Label