Updated: Jul 23, 2021
A song of C Key will usually have chords of:
C Dm Em F G Am B
However, if you find such song which comes with E chord as well, it doesn't mean that is wrong.
It is because of using Harmonic Minor...
Here is why:
First of all, a song of C Key is having Am as its relative natural minor key.
List the scale of Am key:
A B C D E F G A <------ This is Natural Minor
*** Watch out *** Sharp the seventh note:
A B C D E F G# A <------ This is Harmonic Minor
Okay now, find out all the chords having G#
1. C + E + G# -----> Caug
2. E + G# + B -----> E
3. G# + B + D -----> G#dim
4. no more...
According to above available chords, E is oftenly applied in composing because among the three chords, it is the most popular chords, most general chords, the easiest to use and to get a result of comfortable melody for human ears.
For eg. 你的名字我的姓氏, a song in C Key will have E chord.
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