Chord Types Explained
Thirteen chord shapes, built from one triad
Every chord type below starts from the same major scale idea and moves one or two notes. The finder groups these into triads (three notes) and 4-note chords, matching the layout of the chord finder above — try each one there to hear the difference.
Triads
Major Triad
Root, major 3rd, perfect 5th. The brightest, most stable-sounding chord — the default sound most people picture when they hear the word “chord.” Example: C major = C–E–G.
Minor Triad
Root, minor 3rd, perfect 5th — only the third is lowered by a semitone compared to major. This single semitone shift is what makes a chord sound sad or moody rather than bright. Example: C minor = C–E♭–G.
Diminished
Root, minor 3rd, diminished (flattened) 5th. Tense and unstable-sounding, almost always used briefly to lead into another chord rather than to sit on. Example: Bdim = B–D–F.
Augmented
Root, major 3rd, sharpened 5th. An unsettled, dreamlike sound used sparingly for colour or as a bridge between two chords. Example: Caug = C–E–G♯.
Sus2 & Sus4
“Suspended” chords remove the third altogether and replace it with the 2nd or the 4th, so the chord is neither major nor minor — open and unresolved. They're often played just before resolving back to the plain major or minor triad. Example: Dsus4 = D–G–A.
4-Note Chords
Dominant 7th
A major triad plus a minor 7th on top. This chord creates tension that wants to resolve, which is why it's used so heavily on the fifth chord of a key (the “dominant”) just before returning home. Example: G7 = G–B–D–F.
Major 7th
A major triad plus a major 7th. Smoother and dreamier than a dominant 7th, common in jazz and ballad accompaniment. Example: Cmaj7 = C–E–G–B.
Minor 7th
A minor triad plus a minor 7th. Warm and mellow — a staple of soul, jazz and lo-fi accompaniment. Example: Am7 = A–C–E–G.
Major 6th
A major triad plus a major 6th, replacing the tension of a 7th with a softer, jazzier colour that still feels resolved. Common as a closing chord in jazz standards and 1930s–50s pop. Example: C6 = C–E–G–A.
Minor 6th
A minor triad plus a major 6th — a slightly unsettled, cinematic minor sound often heard in film scores and jazz ballads. Example: Cm6 = C–E♭–G–A.
Diminished 7th
A diminished triad plus a diminished 7th, stacking minor 3rds all the way up. Highly unstable and dramatic, it's a favourite for building tension in classical and musical-theatre writing. Example: Cdim7 = C–E♭–G♭–A.
Add9
A major triad with an extra 9th (the note a tone above the octave, same letter as the 2nd) added on top — not to be confused with a 7th chord, since there's no 7th present. It gives a bright, open, slightly modern pop sound. Example: Cadd9 = C–E–G–D.
🎵 Which Chords to Learn FirstStart with major and minor triads in C, F, G, D, A and E — that handful covers the vast majority of beginner piano and guitar-songbook material. Add dominant 7ths next (they resolve so much pop and blues), then circle back for 6th, diminished 7th, add9 and the rarer augmented and sus chords when you meet them in a piece.