Alright so this lesson will teach you how to use simple knowledge of a minor scale to get 7 chords from it. And all it will take is a little memory.
Lets take a scenario to get started. Say you're at your buds house, and he's like: "Play some chords in the key of D minor!" And you're like: "Whaa?"
So to begin we'll take the example and use the D minor Scale which is:
D, E, F, G, A, Bb, C, and the octave D.
and we're going to be referring to the 'b' as a flat siginal.
And if we add the roman numerals to the notes it would be:
D = I
E = II
F = III
G = IV
A = V
Bb = VI
C = VII
Now using that ^ up there, this is all that you need to remember to get 7 of the chords from the key of D minor:
I = minor
II = Diminished
III = Major
IV = minor
V = minor
VI = Major
VII = major
Which would mean that the chords in D Minor are:
If you remember: "minor, Diminished, Major, minor, minor, Major, Major." In that same order you would have the chords in D Minor, or whatever minor key you want.
So lets practice!
Say your same friend wants to jam in the key of E minor, and luckily for you, you know the E minor scale, which happens to be: E, F#, G, A, B, C, D, and E the octave. And even more luck! You also know that "minor, Diminished, Major, minor, minor, Major, Major." should give you the chords.
So write down, remember or whatever you prefer, what the chords are that you think belong to the key of E minor.
Alright! What did you get?