Changes : Jazz Sheet Markup

Create practical jazz charts with simple text — and take them straight to the jam session.

Write a lead sheet using simple text or standard ABC notation, see it rendered instantly, transpose it for different instruments and playing situations, play it back for practice, and share it with your session partners.

Send the chart as plain text for easy editing, or display the finished sheet fullscreen for rehearsal and screenshot sharing.

■KEY FEATURES

● Simple Text-Based Lead Sheet Editing

Create practical jazz charts without the complexity of traditional notation software.

・Type simple text or standard ABC notation
・See your lead sheet rendered in real time
・No mandatory ABC headers — start writing notes and chords immediately
・Automatic measure fitting keeps notation readable even when note counts vary
・One-tap note-length conversion (L: 1/8 ⇔ L: 1/4)

Example:
"Dm7" D F A c | "G7" B4 |

Turn simple text into a readable lead sheet instantly.

● Real-Time Live Rendering

Forget clicking "Render".

Your sheet music updates dynamically as you type, giving you immediate visual feedback while writing and editing.

● Flexible Transposition for Real-World Playing

Handle complicated transposition situations without manually calculating keys.

The song key and the player's instrument key can be set independently.

For example, if the original chart is in B♭, a front player requests C, and an E♭ alto saxophonist needs to read the resulting part, Changes can handle these transposition steps independently.

・Independent song-key and instrument-key settings
・B♭ instruments: Tenor Sax, Trumpet
・E♭ instruments: Alto Sax, Baritone Sax
・F instruments: French Horn
・Transpose melody for the player's instrument while optionally keeping chords in concert pitch
・Full-song transposition for vocalists and other front players

● Fullscreen Sheet Music

Turn your phone or tablet into a practical digital lead sheet.

・Hide editors and controls with one tap
・Immersive fullscreen with system bars hidden
・Keep the screen awake during rehearsals
・Tap the sheet or press Back to exit
・Ideal for rehearsal, performance, and screenshot sharing

● Audio Playback & Practice

Hear your chart directly from the editor.

・Play and Stop controls
・Realistic swing/jazz feel
・Adjustable BPM
・Mute melody to practice improvisation
・Mute chords to practice comping

Write it, play it, and practice it from the same screen.

● Flexible Notation & View Customization

Customize your charts to match your playing style.

・Chord Only mode for rhythm charts and chart reading
・Adjustable chord text size
・Adjustable staff line spacing
・Jazz chord symbol preferences:

Half-diminished: m7-5 ⇔ ø
Minor: m ⇔ -
Major: Maj ⇔ △ ⇔ M
Diminished: dim ⇔ o
Augmented: aug ⇔ +

● Interactive GUI Editing

Need a quick change?

Tap a note, chord, or measure directly on the rendered sheet and adjust it through an interactive dialog.

Combine fast text editing with quick visual adjustments.

● Share, Edit & Collaborate

Designed for the way musicians actually exchange charts.

・Save and load lead sheets from your personal library
・Share charts as clean plain text
・Send them through messaging apps, email, or cloud storage
・Let session partners edit the text and send it back
・Show a clean fullscreen chart or share it as a screenshot

A lead sheet doesn't always need to be a PDF — sometimes a few lines of text are all you need.

● AI Composition Assistant

Optional AI tools for when you want help creating a chart.

・Generate jazz lead sheets using your own Gemini API key
・Copy ready-to-use prompts to the clipboard
・Use prompts with your preferred AI service

■FOR JAZZ PLAYERS, COMPOSERS & MUSICIANS

Write it as text.
See it as music.
Set the song key.
Set the player's instrument.
Transpose it.
Play it.
Practice it.

From a quick chord chart at a jam session to a complete jazz lead sheet, Changes helps you move between text and practical sheet music without getting in the way of your music.