TrackComposer
Compose, sketch, and prompt — before you spend a credit.
A free music sketchpad in your browser. Sketch out your idea in any style — work out the chords, the melody, the groove, and the Suno prompt, hear all of it, and extend it with AI — before you ask a generator to render a single take.
One studio, seven rooms
Every page edits something real — a progression, a take, a groove, a prompt. Here is the whole tour, in the order a track tends to happen.
Start with harmony
Explorer
Pick a mood and an archetype and get a real chord progression — then spin variants: tritone substitutions, walk-downs, borrowed chords, modulations. Every variant is a correctly spelled progression you can audition with one click.
- Archetype progressions across nine modes
- Nine theory-aware variation operations
Sketch the notes
Pianoroll
An 88-key grid for one part at a time, with the harmony living under it bar by bar. Scale overlays tint the rows that fit; snap keeps the melody in key — or off it, on purpose.
- Per-bar chords from a key-aware vocabulary
- 21 scale overlays with snap-to-scale
Zoom out
Arrangement
The same project as lanes: every part, the chord lane, a mixer. Import MIDI you already have, export standard MIDI any DAW reads, or let AI-assist compose a take you preview before keeping.
- MIDI import and export
- Per-part gain, mute, and solo
- AI compose with preview-before-apply
- Export audio rendered with real instruments
Speak Suno
Song Builder
Builds the two Suno text boxes — styles and lyrics — from data-driven kits. Section headers, style tags, and inline chord brackets come out structured and consistent, ready to paste.
Grow the library
Kit Construction
Import and manage variation-kit documents, or have AI generate and convert structured kits. Every kit you keep becomes a starting point in the Song Builder.
Find the groove
Sequencer
16-step drum patterns chained into sections, with swing and a loop transport. Sketch the rhythm the same way you sketched the harmony: fast, audible, disposable.
Choose the sound
Instruments
A SoundFont store: browse, audition, and organize fonts by the thousand, then build custom banks the whole studio plays through.
What makes it work
Sketch any idea, any style
Start from a mood and an archetype and get a real progression in whatever genre you point it at. TrackComposer is a sketchpad first — chords, melody, and groove, fast and disposable.
Theory you can see and hear
Scale overlays light the notes that fit and every chord auditions in a click, so the app guides you by sight and by ear. No music-theory knowledge required — TrackComposer does the theory for you.
Extend your ideas with AI
AI-assist composes takes, suggests melodies, and builds whole kits to push a sketch further. Every proposal is validated and previewed; nothing lands until you apply it.
Suno prompts in high detail
The Song Builder compiles your sketch into the two Suno text boxes in full detail — so you generate deliberate variations of your song instead of rolling the dice on a one-line prompt.
Export audio with real instruments
Export standard MIDI any DAW reads, or render the sketch to audio played by real SoundFont instruments — hand Suno a proper performance so it plays your song with the right instrumentation, not its best guess.
Local-first, no install
Everything musical runs in your browser — playback, editing, generation. Open it, play a chord, save a track; your sketches are yours and the hosted Cloud mode is optional.
Questions, answered honestly
Is it free?
Yes. Open it and start sketching — composing, playback, and MIDI export cost nothing. The hosted service puts fair-use quotas on storage and the AI-assist features, and that's the whole catch.
Do I need to know music theory?
No — TrackComposer does the theory for you. Progressions come out correctly spelled, scale overlays show which notes fit, and every chord auditions in a click, so the app guides you visually and by ear. Follow your instinct for the sound you want; the app keeps it in key.
Do I need Suno?
No. TrackComposer is a complete sketchpad on its own: chords, melodies, drums, playback, MIDI export. If you do use Suno, the Song Builder turns your sketch into the two prompt boxes — so the credits you spend go to takes whose bones you've already heard.
Does it run locally?
Everything musical — the sound engines, editing, progression generation — runs in your browser; the server's jobs are storing your files and preparing SoundFonts. Local-first is the design rule the whole app is built around.
What's Cloud mode?
app.trackcomposer.com is the hosted version: sign in and your tracks, kits, and SoundFonts follow you between machines. The app behaves identically either way.
Which browsers work?
Current Chrome, Edge, Firefox, and Safari on desktop. It uses WebAudio and WebAssembly, which every modern browser ships. A keyboard and a real screen help — it's a studio, not a feed.
Start sketching. Spend credits when it's worth it.
Open the studio, pick an archetype, and hear a progression in the next sixty seconds.
Open TrackComposer — free