A triad consists of three notes: the tonic (or the first note of the scale), the mediant (or the third note of the scale), and the dominant (or the fifth note of the scale).
For a major triad, the interval between the first and third note is a major third, and the interval between the first and fifth note is a perfect fifth.
For a minor triad, the interval between the first and third note is a minor third, and the interval between the first and fifth is a perfect fifth.
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Quite the same way you would in any other minor key. In a minor key, the chords are as follows: i iidim III iv V VI VII. So, naturally, following the rules of building triads, one would build a minor triad for i, a diminished triad for ii, major for III, minor for iv, major for V, Vi, and VII. So, "i" would look like this: Root-->third-->fifth. Because it is a minor triad, the third is a minor third up from the root, and the fifth is a pefect fifth up from the root. So, in A-minor, the 'i' triad would be A(root), C(third), E(fifth). The same applies to all minor chords. The diminished chord is similar, but both intervals are minor thirds, rather than a minor third and a major third. So, in A-minor, that would be B, D, F. Major chords are the opposite of minor chords, the structure being major third, then minor third, rather than minor third, then major third. Hope this helps, let me know if there is anything I can clear up for you. Cheers, Dan
D major, B minor, G major, E minor, A major, F # minor, E major, C # minor, B major, G # minor, F # major, D # minor, C # major, A # minor, and maybe some others
It depends on which key. It's the tonic in C major/minor, the 2nd in Bb major/minor, the 3rd in Ab major and A minor, the 4th in G major/minor, the 5th in F major/minor, the 6th in Eb major and E minor, and the 7th in Db major and D natural minor.
The relative minor key for A major is F# minor.
The relative minor of Ab Major is f minor.