Chords & Harmony
From how chords are built, to writing progressions, to analyzing the key of a song. Understanding chords unlocks the harmonic logic behind all music.
Start here
Diatonic Chord Reference
Pick a key and see all 7 diatonic chords color-coded by function (tonic / subdominant / dominant). The clearest single snapshot of how harmony works inside a key.
Learning path
- 1
Diatonic Chord Reference
See the 7 usable chords in any key with the Diatonic Chord tool
- 2
Chord Progression Player
Hear classic progressions with the Chord Progression Player
- 3
- 4
Chord Progression Analyzer
Decode the chords in your favorite songs with the Chord Analyzer
Related tools in this topic
Chord Finder
Look up chord tones by name, or tap notes on the keyboard to identify a chord. Free browser tool, no install.
Chord Diagram
Look up guitar chord shapes as diagrams. Tap any chord to hear it. Free browser tool, no install.
Transpose Tool
Transpose a chord progression to a new key. Compare before and after by ear. Free browser tool.
Related articles
- What Are Borrowed Chords? Understanding Non-Diatonic Harmony
- How to Analyze a Chord Progression — Reading Keys and Degrees
- What Is Chord Function (T/SD/D)? Music Theory Basics
- Dominant Motion (V→I): The Engine of Chord Progressions
- Building Chord Progressions — An Emotion-Based Beginner Guide
- How to Read Chord Symbols (Cm7, Cadd9, Csus4…)
- What Are Chord Tones? A Complete Breakdown
- How to Write Your Own Chord Progressions