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In the symbolism of post 23 ,the two ways are the next
1) With A-shape as root, where the I, and V are on the same fret. In the symbolism of post 23 the (nA)X means at n-th fret play the shape A and it sounds as chord X. Here instead of X we will utilize the Latin symbols of the steps in a major scale, as it is standard in Jazz with small if the chord is minor and capital if the chord is major
So the chords I, ii, iii, IV, V, vi, vii, are played on the fretboard only as shapes A and E as follows
I=(nA)I, ii=((n+2)Am)ii , iii=((n-3)Em)iii, or ((n-1)D)iii, IV=((n-2)E)IV, or (nD)IV, V=(nE)V, vi=((n-3)Am)vi or vi=((n+2)Em)vi vii=((n-1)dim7)vii.
In short the three main major chords I, IV, V are the
I=(nA)I, IV=((n)D)IV, V=(nE)V.
It is easy to remember this 3-chord progression position, as the IV, and V are one tone apart and so they should be in the fretboard, and here have to be the E shape. While the I,is related to V as the successive resolution chord in the cycle of 12 chords (see also post 30) , thus it has to be on the same fret with V, but as an A shape.
2) With E-shape as root, where the I, and IV are on the same fret. In the symbolism of post 23 the (nE)X means at n-th fret play the shape E and it sounds as chord X. Here instead of X we will utilize the Latin symbols of the steps in a major scale, as it is standard in Jazz with small if the chord is minor and capital if the chord is major
So the chords I, ii, iii, IV, V, vi, vii, are played on the fretboard only as shapes A and E as follows
I=(nE)I, ii=((n+3)Am)ii , or ii=((n+2)Em)ii , iii=((n-1)Am)iii, IV=((n)A)IV,
V=((n+2)A)V, vi=((n-3)Em)vi , vii=((n-1)dim7)vii.
In short the three main major chords I, IV, V are the
I=(nE)I, IV=((n)A)IV, V=((n+2)A)V.
It is easy to remember this 3-chord progression position, as the IV, and V are one tone apart and so they should be in the fretboard, and here have to be the A shape. While the IV,is related to I as the successive resolution chord in the cycle of 12 chords (see also post 30) , thus it has to be on the same fret with I , and here the I is an E shape.
It easy to convert these fretboard positioned chords in to figures on the fretboard.
As for the equivalence of chords in different positions and shapes on the fretboard for the barre shapes A and E holds the rules
1) The A shape sounds as the same chord withE shape 5 frets higher , In symbols e.g. (1A)A=(5E)A and in general (nA)X=((n+5)E)X
2) The E shape sounds as the same chord with A shape 7 frets higher , In symbols e.g. (1E)E=(7A)E and in general (nE)X=((n+7)A)X
