
Minor triads are much like major triads, but played out of context they can sound a little ‘sadder’. Their construction is almost the same, however instead of 1, 3, and 5, we take 1, b3, and 5.
To use the example of C Minor, we need to first start with the scale of C Major:
C D E F G A B C
1, 3, and 5 = C, E, and G
But we need to Flatten the E so it becomes an Eb
The C minor triad therefore consists of C, Eb, and G.
—–
D Minor would be (again starting with the scale of D Major):
D E F# G A B C# D
1, 3, and 5 = D, F#, and A
But we need to Flatten the F# so it becomes a F
The D minor triad therefore consists of D, F, and A.
—–
A Minor, (again starting with the scale of A Major):
A B C# D E F# G# A
1, 3, and 5 = A, C#, and E
But we need to Flatten the C# so it becomes a C
The A minor triad therefore consists of C, Eb, and G.