Can somebody explain to me what the reasoning or the “philosophy” behind it is? I know ( moreso accepted because I haven’t really applied it ) how it looks on the guitar with the shapes and such but It’s not connecting ( coming to me in a holistic way if that makes sense )
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It is a long since I saw the real explanation of it but the general idea is that shapes on guitar are movable. If you play a C major triad, move the same shape two frets up and you get a D major triad. “In the same fret range” you have different shapes for the same thing and these shapes are often referred as the C,A,G,E and D shape corresponding to the ground note in the lowest possible position of that shape.
A good example are bar chords. The most common bar chords are the E shape, where your fingers make the pattern of an E chords but with a bar instead of playing open strings, and the A shape. But you can do the same with a C,G or D chord. This way every chord can be played in multiple different shapes but at different positions, improving the number of possibilities.
The reason it are C,A,G,E and D has to do with the tuning of the guitar. In normal guitar tuning C,A,G,E and D major, minor, 7, … can all be played as open chords (played with also playing open strings) while other (F an B) can’t.
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