Turn a lead sheet into a band chart.
Open a lead sheet — just melody and chords, as PDF or MusicXML — and get a full arrangement for horn, piano or guitar, bass and drums, with audio.
How it works
Open the score
Drop a lead-sheet PDF or MusicXML on the window. MusicXML loads in about a second and needs no API.
Choose the band
Pick the melody instrument, piano or guitar, a voicing, and bass and drum styles — or pick a genre to set them all.
Finish it on the score
Check the result on screen, change comping or voicing bar by bar, and play it back.
What it does
- Input
- PDF (read with the Claude API), MusicXML (.musicxml / .xml / .mxl), lead sheet .txt. Transposing parts are converted to concert pitch.
- Export
- MusicXML (full score with parts), MIDI, MP3, iReal Pro.
- Genre
- Even 8th / Pop, Swing (jazz), Funk, R&B / Neo-soul, Bossa nova, Ballad, 8-beat rock
- Melody
- Alto sax (E♭), Tenor sax (B♭), Soprano sax (B♭), Clarinet (B♭), Flute (C), Trumpet (B♭)
- Voicing
- Drop 2&4, Drop 2, Drop 3, Close (4-way close), Shell (1-3-7), Rootless (A/B forms)
- Chords
- Piano / guitar, Sustain on chord changes, Quarter notes, Charleston (dotted quarter + eighth), Eighth-note anticipations, 8-beat comping (pop), Swing comping (short stabs), Funk 16th-note stabs, R&B pads + pushes
- Bass
- Root (sustain on chord changes), Two-feel (root + 5th), Walking (quarter notes), Eighth-note roots, Bossa nova (root + 5th), Funk (16ths, octaves, ghost notes), R&B (syncopated)
- Drums
- Even 8th, Swing, Bossa nova, Ballad (stick / brushes feel), 8-beat rock, Funk 16-beat (ghost notes), R&B half-time
- Score editor
- Per-bar voicing, register, comping, bass and drums; rewrite melody and chords; tempo; playback; undo.
Price
- One license covers the Macs you use yourself
- Updates are free and announced in the app
- Pay by card (Stripe) and download right away
Requirements
- macOS 13 or later on an Apple silicon Mac (M1 or later)
- Intel Macs and Windows are not supported
- Reading PDFs needs an Anthropic API key (see below)
Questions
Does reading a PDF cost anything?
PDF scores are read with Anthropic's Claude API, so you need your own API key. It is billed per use by Anthropic — roughly a few to a dozen yen per page depending on the model and the score. Reading the same PDF again uses the saved result and costs nothing.
Can I use it without an API key?
Yes. Arranging from MusicXML (exported from Sibelius, MuseScore, Finale, Dorico…) or from a lead sheet .txt saved by the app needs no key.
What kind of scores does it work with?
Lead sheets: one melody staff with chord symbols, like jazz fake books or pop chord charts. Transposing parts (e.g. alto sax) are converted to concert pitch.
Can I open the result in Sibelius or MuseScore?
Yes. The score is exported as MusicXML, which all major notation programs open. MIDI, MP3 and iReal Pro exports are included.
Does it run on Intel Macs or Windows?
Not at the moment — Apple silicon Macs only.
Can I get a refund?
As a digital product it is generally non-refundable. If it does not start on a Mac that meets the requirements, contact support within 14 days of purchase and we will refund you.