# 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. > Canonical page: https://elysiatools.com/en/tools/youtube-music-chord-finder - **Category:** Media - **Keywords:** chord progression, melody, harmony, roman numerals, voice leading, music theory, composition, songwriting, contour harmonization ## Overview 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. ## Inputs - **Melodic contour (scale degrees 1-7)** (text): e.g. 1 3 5 3 1 (or do mi sol mi do) - **Target key** (select) - **Mode** (select) - **Progressions per beat** (number) - **Playback tempo (BPM)** (number) ## When to use - You have a melody outline and want possible diatonic chord choices. - You are writing a song and want progressions ranked by voice-leading smoothness. - You want to hear and compare major- or natural-minor triad progressions at a chosen tempo. ## How it works - Enter the melodic contour as scale degrees from 1 to 7 or as do-re-mi syllables. - Choose the target tonic, major or minor mode, and the number of progressions to show per beat. - The tool identifies strict diatonic triads that can harmonize each melodic note and searches candidate progressions. - Results are ranked using root motion, common-tone retention, and functional flow, then displayed with Roman numerals and an audio demo. ## Use cases - Songwriters can turn a short melodic idea into several harmonization options. - Music students can compare scale-degree melodies with diatonic chords and Roman-numeral functions. - Composers can explore smooth major- or natural-minor progressions before developing a full arrangement. ## Frequently asked questions ### 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. 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