Click on the chord symbol for a diagram and explanation of each chord type:
A | Am | Asus2 | Asus4 | Amaj7 | Am7 | A7 | Adim7 | Am7♭5
Chord Symbol: A or Amaj
The A major triad consists of a root (A), third (C♯), and fifth (E). The distance between the root and the third is a major third interval (or four half-steps), and the distance between the third and the fifth is a minor third interval (or three half-steps). Major triads have a “happy” sound.
Chord Symbol: Am
The A minor triad consists of a root (A), third (C), and fifth (E). The distance between the root and the third is a minor third interval (or three half-steps), and the distance between the third and the fifth is a major third interval (or four half-steps). Minor triads have a “sad” sound.
Chord Symbol: Asus2
In the Asus2 chord, the third of the A major or minor chord (C♯ or C) is replaced (“suspended”) with a major 2nd (B).
Chord Symbol: Asus4
In the Asus4 chord, the third of the A major or minor chord (C♯ or C) is replaced (“suspended”) with a perfect 4th (D).
Chord Symbol: Amaj7
A major 7 chord is a major triad with an added seventh. The distance between the root and the seventh is a major 7th interval.
Chord Symbol: Am7
A minor 7 chord is a minor triad with an added seventh. The distance between the root and the seventh is a minor 7th interval.
Chord Symbol: A7
A dominant 7th chord is a major triad with an added seventh, where the distance between the root and the seventh is a minor 7th interval.
You can also think of dominant 7th chords as being built on the fifth note of a major scale and following that scale’s key signature. For example, A7 is built on A, the fifth note of D major, and follows D major’s key signature (F♯, C♯).
Chord Symbol: Adim7
A diminished 7th chord is a four-note-chord where each note is a minor third apart. You can think of diminished 7th chords as a “stack of minor thirds.”
Chord Symbol: Am7♭5
The half-diminished chord is also called the “minor seven flat five” chord. It is a minor 7th chord where the fifth is lowered by a half-step.
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