Twelve bar lite
As a purely theoretical exercise and in a crazy moment I started to consider the notes in a 12 bar in G just to see what 'overlaps' there might be. I noted that the fifth of G is the D and the fifth of C Is the G and of course the first of D is D. So it could be argued that all you need are the notes G and D to play a 12 bar.
It would be the most unexciting bass line ever played but it made me begin to wonder what other 'lite' versions for chord progressions might worth exploring.
Many Chord progression overlap..that is the beauty of a progressions that it flows.
Your example is simple Cycle of 5ths based on Tetra chords
C is CDEF GABC
G is GABC DEFG
D is DEFG ABCD
to make them the correct keys you add a # to the F for G major, F & C for D Major. This also allows you to 'overlap' in to A minor, E minor and Bb minor.
Check out a "50s" progression of I VI IV V or I VI II V same idea again of the Harmonised Major scale.
Fascinating. So apart from counting it all out on your fingers or writing it down as your Tetra chord example, are there any established 'rules' or ways of identifying 'overlapping' progressions either theoretically or on the fretboard?
Chord progressions are smooth because of shared notes or small steps.
But I'd venture to say, because it's what I've been taught,chord substitutions are usually based on shared notes.
Tetrachord theory will layout only so much, but is a great foundation, i believe an essential foundation but that is just me, to understanding better the construction elements in music.
Check out these to videos that deconstruct two simple songs and how their construction can cross over to make new tension, so change the feel.
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