Given a key note, you can build up any sort of scale, for scales are just patterns of whole and half steps. The minor and major are examples.
Now, if the scale is the set of notes, the harmonic field is the set of chords.
So, suppose we want to write a music in the C key. The next natural step is to search chords. Well, here I became confused; I will explain:
It seems that the "harmonic field construction" is formed, every time, just with the major scale! Example:
- key: c
- major scale: c d e f g a b
- Harmonic field: C Dm Em F G Am Bdim
My question is:
How to build the harmonic field in general?
Note that, I know how to pick a key note, and I know how to establish a scale pattern and write the scale for a given key note. But, the harmonic field in 3) is very specific, the II, III and VI degrees are minor chords, the I, IV and V are major chords and the last degree is diminished. So, I suspect that if I write the minor scale in 2) the harmonic field will not follow the rules of 3).