Identifying Chord Qualities by Ear
Nine chord qualities, one skill: listen to the 5th (perfect or altered?) and the 7th (present, and how tense?) and every chord quality sorts itself out.
Four triad qualities
Every triad quality shares the same root, and differs only in its 3rd and 5th: major (major 3rd, perfect 5th) sounds stable and bright; minor (minor 3rd, perfect 5th) sounds stable but dark; diminished (minor 3rd, flat 5th) sounds small, tense, and unstable; augmented (major 3rd, sharp 5th) sounds stretched and hazy. Once major and minor feel automatic (see the previous lesson), diminished and augmented are really just "minor with a squeezed 5th" and "major with a stretched 5th."
Five 7th-chord qualities
Adding a 7th on top of a triad adds a new layer of tension that's easy to categorize once you know what to listen for:
| Chord | Triad | 7th | Character |
|---|---|---|---|
| Major 7 | Major | Major 7th | Smooth, dreamy, lush |
| Minor 7 | Minor | Minor 7th | Mellow, warm, jazzy |
| Dominant 7 | Major | Minor 7th | Bluesy, restless, wants to resolve |
| Half-diminished 7 | Diminished | Minor 7th | Moody, unstable but softer than fully diminished |
| Diminished 7 | Diminished | Diminished 7th | Symmetrical, maximally tense, suspenseful |
Notice the pattern: the 7th's exact size (major, minor, or diminished) is what separates maj7 from dom7 from a fully diminished 7 — even when the triad underneath is identical.
Common questions
What is the difference between a diminished and augmented triad by ear?
A diminished triad sounds small and tense from its flattened 5th; an augmented triad sounds stretched and dreamlike from its sharpened 5th. Both feel unresolved compared to major or minor.
How do I tell a major 7 chord from a dominant 7 chord by ear?
Listen to the 7th. A major 7th sits one semitone below the octave and sounds smooth; a dominant (flat) 7th sits a whole tone below and sounds more tense and restless.
What makes a half-diminished 7 sound different from a full diminished 7?
Half-diminished adds a minor 7th to a diminished triad for a moody, jazzy color; fully diminished uses a diminished 7th for a symmetrical, extra-tense sound.
What's the best way to practice hearing chord qualities?
Master the four triad qualities first, then add 7th chords one at a time, always comparing new chords against ones you already know.
Train your ear for real
Melody Monkey's Ear Training game drills chord quality recognition with instant feedback and rewards correct answers with credits.
Open the ear trainer →Still stuck? Ask Your Personal Music Teacher about Identifying Chord Qualities by Ear →