What melodic input does the tool accept?

Enter a contour using scale degrees 1-7 or solfège syllables such as do mi sol mi do.

Which keys and modes are supported?

You can select any listed chromatic tonic from C through B and choose major or minor mode.

Does the tool detect chords from audio?

No. It uses the melodic contour you enter and does not analyze audio recordings.

What type of chords are used?

The tool uses strict diatonic triads from major and natural-minor scales.

Can I listen to the suggested progressions?

Yes. Results include a browser-based Web Audio demo that uses the selected playback tempo.

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Chord Progression Finder from Melodic Sketch

Enter a melodic contour as scale degrees (1-7 or do-re-mi) plus a target key, and get candidate diatonic chord progressions ranked by voice-leading smoothness, with roman-numeral analysis and an audio demo.

Details

What this tool helps you do

Given a melodic line expressed as scale degrees and a key, this tool finds which diatonic triads can harmonize each note, then searches candidate chord progressions and ranks them by a combined smoothness score: root-motion strength (4th/5th motion preferred), common-tone retention between successive chords, and functional flow (tonic → pre-dominant → dominant → tonic). Output is ranked progressions with roman numerals plus a browser-side Web Audio audition. Uses strict diatonic major/natural-minor triads; does not detect chords from audio or guess borrowed chords. Pair with the Chord Progression Roman Numeral Visualizer to analyze an existing progression.

Execution

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Prepared example runs

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2 examples

C major 1-3-5 contour → ranked diatonic progressions

A simple ascending do-mi-sol (1-3-5) melodic sketch in C major. Returns ranked candidate chord progressions with roman numerals, the smoothest typically harmonizing degree 1 with I, 3 with I or iii, and 5 with I or V, plus an audio demo at 96 BPM.

<section><h2>C major</h2><div class="cards"><article class="best">#1 smoothest I – I – I</article></div></section>

A minor 6-5-4-3 descending → minor-key candidates

A descending la-sol-fa-mi (6-5-4-3) melodic line in A minor. Demonstrates minor-mode harmonization with natural-minor triads (i, ii°, III, iv, v, VI, VII) and voice-leading ranking among minor-key options.

<section><h2>A minor</h2><div class="cards"><article class="best">#1</article></div></section>

Inputs

Set the required fields, then run the tool.

5 options

ContentPaste or type the main input values.1

Melodic contour (scale degrees 1-7)textRequired

SettingsAdjust formats, ranges, numbers, and modes.4

Target keyselectRequiredModeselectRequiredProgressions per beatnumberRequiredPlayback tempo (BPM)numberOptional

Result

Ready for a run

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Samples

Chord Progression Finder from Melodic Sketch

What this tool helps you do

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Prepared example runs

Inputs

Result

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Harmonizing a C major do-mi-sol sketch

2. Exploring an A minor descending melody

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