D

In order to know how to spell a D major chord you need to use the D minor chord as your starting point. You will use Dm as your starting point for any chord with the root of D, D, or D. That again is because Dm contains no sharps or flats. Therefore you use the Dm as a baseline template that you will alter to get every other D related chords.

Dm = D(1), F(3), A(5)

The chord formula for a minor chord is 1 3 5. So therefore we need to raise the F(3) in a Dm chord to an F(3) for the D major chord.

D = D(1), F (3), A(5)

Gm

In order to know how to spell a Gm chord you need to use G major as your starting point.

G = G(1), B(3), D(5)

The chord formula for major is 1 3 5. The chord formula for a minor chord is 1 3 5. So therefore we need to lower the B(3) in the G major chord to a B(3) to spell a Gm chord.

Gm = G(1), B(3), D(5)

Bm

In order to know how to spell a Bm chord you need to use the Bdim chord as your starting point.

Bdim = B(1), D(3), F(5)

The chord formula for diminished is 1 3 5. The chord formula for a minor chord is 1 3 5. So therefore we need to raise the F(5 )in a Bdim chord to an F(5) for the Bm chord.

Bm = B(1), D(3) F(5)

Fm

In order to know how to spell an Fm chord, you need to use an F major chord as your starting point.

F = F(1), A(3), C(5)

The formula for a major chord is 1 3 5, and a minor chord has the formula of 1 3 5. So you just have to lower the A(3) in the F major chord to an A(3) in an F minor chord.

Fm = F(1), A(3), C(5)