Song Builder

Stuck on a deadline? Plan the shape before the notes. Pick a form or a genre, do the tempo⇄length math to learn exactly how many measures to write, map where the instruments come and go, and jot the mood and arrangement ideas as they land. Everything stays on this device and saves as you go; export the plan as a sheet or JSON when you're ready to write.

Start from

Loading replaces the sections below. New sections use these defaults:

Sections & length

Set a target and Fit scales every section proportionally to hit it — or edit any section's bars, tempo, and meter directly and watch the total update. Compound meters (6/8, 12/8) are counted in dotted beats.

Arrangement map — who plays where

Toggle a cell to bring an instrument in for a section. Build the energy: watch parts stack toward the choruses/drops and thin out for verses and breakdowns.

Orchestration, mood & genre reference

Orchestration roles & mood palette

Every full arrangement covers these roles. If it sounds thin or muddy, check which role is missing or doubled.

Mood & energy words

Unstuck checklist

• Pick a form and a target length first — constraints beat a blank page.
• Write the chorus/drop hook before the verses; everything serves it.
• Give every section a different energy from its neighbour (contrast = motion).
• Introduce one new element per section so the arrangement keeps growing.
• Save the biggest, fullest version of the hook for last.

Browse genre conventions

How each genre treats form, tempo, and instrumentation. Use loads it as a starting point.

Notes

Export & save

Your plan saves to this browser automatically. Take it with you: