Analysis & Transposing
SATB Part Writing Checker & Auto Writer
About this tool
Free SATB part writer and voice-leading checker. Write all four voices in one click, or check your own for parallel fifths, spacing and unresolved sevenths.
Place the four voices and it will flag any voice-leading errors.
The engine searches for a voicing that satisfies range, doubling and spacing for every chord, then the rule check below runs on it.
Four voices (checked as you type)
Editing chord 1
Chord tones: C – E – G
Findings
No problems
Nothing found in range, spacing, doubling or voice leading.
Ranges used here are soprano C4–G5, alto G3–D5, tenor C3–G4, bass E2–C4. The note menus are limited to the scale of the current key (minor offers both the natural and harmonic forms).
Related ArticlesWhat is this tool?
Part writing means setting chords for four voices — soprano, alto, tenor and bass — under the rules of classical harmony: range, spacing, doubling and voice leading. In a harmony exercise you normally have to hunt for your own mistakes. This tool can write a correct voicing for every chord in one click — the engine searches for a layout that satisfies range, doubling and spacing — and it checks the four voices as you enter them and reports what is wrong and why, across nineteen kinds of finding including parallel fifths and octaves, voice crossing, excessive spacing, and unresolved sevenths and leading tones. Load one of the worked examples to hear what each rule actually sounds like when it is broken.
When it helps
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Proofread a harmony exercise
Check for parallels and crossings before you hand the work in. It is faster than reading every pair of voices yourself, and it misses nothing.
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Hear why a rule exists
Load the parallel fifths example and play it: the two voices melt into one. That is easier to remember than the rule itself.
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Practice realizing a figured bass
Choosing a scale degree and an inversion fixes the bass. Your job is then to place the upper three voices without triggering a single finding.
How to use
- 1 Choose the key and whether it is major or minor — the note menus follow the key automatically
- 2 For each chord, pick the scale degree, triad or seventh, and the inversion
- 3 Set each voice from its dropdown, or press "Voice it for me" for a standard layout
- 4 Read the findings and watch which chord is highlighted
- 5 Press play to hear it, then compare a version with an error against the corrected one
Related Tools
Lessons that use this tool
The sections of the systematic curriculum where this actually comes up.