Last weekend I told Angel what chords should belong to a key in generally case. She asked me why. That is really a good question. I just listened from jazz guitar teacher but never think the reason behind. I pick up my pencil and draw out their relationship. Finally got the reason (actually the guitar teacher should explained in class, just I forget).
Take C key as example, the following chords are basically match with it.
Cmaj7 Dm7 Em7 Fmaj7 Gm7 Am7 Bm7b5
Why? Let list out the note in each chord.
| Cmaj7 | Dm7 | Em7 | Fmaj7 | Gm7 | Am7 | Bm7b5 |
|---|---|---|---|---|---|---|
| C | D | E | F | G | A | B |
| E | F | G | A | B | C | D |
| G | A | B | C | D | E | F |
| B | C | D | E | F | G | A |
This seems not much special. However, you may notice that all elements in these 7 chords are belonging to C major scale. It would be more obvious if showing their so-fa name in C key.
| Cmaj7 | Dm7 | Em7 | Fmaj7 | Gm7 | Am7 | Bm7b5 |
|---|---|---|---|---|---|---|
| Do | Re | Mi | Fa | So | Li | Ti |
| Mi | Fa | So | Li | Ti | Do | Re |
| So | Li | Ti | Do | Re | Mi | Fa |
| Ti | Do | Re | Mi | Fa | So | Li |
So, that's means?
All these 7 chords are made by C major scale, so their sound would be match with a song in C key. However, this is just generally correct. In some cases a half-step tone would make the song much more interesting.
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