Key of A Minor
The 7 diatonic chords in A Minor, shown with their Roman numeral function and color-coded intervals.
A Minor Scale & Chords
The A Minor scale contains the notes: A, B, C, D, E, F, G.
The 7 diatonic chords are: i = Amin, ii° = Bdim, III = C, iv = Dmin, v = Emin, VI = F, VII = G.
Key Signature of A minor
The key of A minor shares its key signature with C major — both have no sharps or flats — the only key on the white keys of a piano. A key signature defines which notes are sharp or flat throughout a piece of music, and A minor uses the same set of seven pitches as its relative major, simply organised around a different tonic. This shared signature is why pieces in A minor can modulate to C major (and back) without changing a single accidental.
Diatonic Harmony in A minor
In A minor, the seven diatonic chords above are arranged so the i, iv, and v are all minor — this is what gives the natural minor scale its characteristic dark, unresolved quality. Composers who want a stronger pull toward the tonic typically borrow the major V chord from the harmonic minor scale, replacing the natural minor v with a major V (or V7) chord. The resulting cadence sounds far more conclusive, which is why almost every minor-key composition mixes natural and harmonic minor harmony freely.
Common Modulations from A minor
Pieces in A minor most commonly modulate to three places. A move to E minor (the dominant) feels like forward motion or rising tension, since it pulls toward a more energised tonal centre. A move to D minor (the subdominant) feels relaxed and broad, like the music is opening outward. A move to C major (the relative key) keeps every note in place and simply re-centres the harmony — this is how a song can flip emotional polarity from dark to bright without disrupting the listener. A more dramatic shift to the parallel A major changes both the third and the colour of the key, and is often saved for a key moment in a song.
Listening for A minor
When listening for A minor in real music, two things give it away. The first is the recurring pull toward A as the resting note — phrases tend to land there. The second is the colour of the third above that root: a minor third sits a half-step below the major third, and that small interval difference is the entire emotional difference between a sad-sounding key and a bright one. The progression list above shows the most idiomatic chord movements you will hear in any pop, rock, jazz, or classical piece written in A minor.