Analyze & Understand
From key detection to chord reverse lookup, progression analysis, and transposition. Turn what you hear into practical theory you can apply.
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Chord Progression Analyzer
Paste a progression and instantly see estimated key plus harmonic function (T/SD/D). Fastest bridge from songs to theory.
Learning path
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Transpose Tool
Transpose the result into practical keys with Transpose Tool
Related tools in this topic
Diatonic Chord Reference
Choose a key and see its diatonic chords instantly. Compare triads and seventh chords by ear, then use them for songwriting or progression practice.
Circle of Fifths
Tap the circle of fifths to hear key relationships, accidentals, and V-I movement. A visual way to understand keys, modulation, and progressions.
Progression Generator
Pick a key and a mood, then generate a musically coherent chord progression and play it back instantly.
Related articles
- How to Use the Circle of Fifths for Chord Progressions
- Key Signatures: Count Sharps and Flats by the Fifths
- That Surprising Chord That Catches Your Ear — Borrowed Chords
- How to Analyze a Chord Progression in a Song You Love
- Why Chords Feel Settled or Tense — Chord Function (T/SD/D)
- What Does Cm7 or Csus4 Mean? Reading Chord Symbols
- Which Notes Make Up a Chord? Chord Tones Explained
- What Is the Circle of Fifths and How Do You Use It?