Chord & FretHarmonic field of A major
The harmonic field of A major is the set of seven chords born from the A major scale — one on each of its notes. The table shows each in two versions: the triad (the three-note chord) and the seventh chord (the same chord with a fourth note, the seventh, that enriches it).
Notes: A – B – C# – D – E – F# – G#| Degree | Triad | Seventh | Function |
|---|---|---|---|
| I | A | Amaj7Amaj7Amaj7Amaj7 | tonic |
| ii | Bm | Bm7Bm7Bm7Bm7 | subdominant |
| iii | C#m | C#m7C#m7C#m7C#m7 | tonic |
| IV | D | Dmaj7Dmaj7Dmaj7Dmaj7 | subdominant |
| V | E | E7E7E7E7 | dominant |
| vi | F#m | F#m7F#m7F#m7F#m7 | tonic |
| vii° | G#° | G#m7b5 | dominant |
The roman numerals mark the chord's position in the scale: I is the first degree, V the fifth. Uppercase = major chord; lowercase = minor; ° = diminished.
Tonic chords stabilize and rest; subdominant chords prepare motion; dominant chords build the tension that asks for resolution.
The tonic chord on all four instruments
In Chord & Fret, open the Circle of Fifths, pick A major and hear every degree — triads and sevenths, with fretboard positions and the key's secondary dominants. Open in Chord & Fret →