The Major Scale Song
A key is a harmonic system based on a scale. Since there are seven different notes in a G Major Scale, there are seven different chords and scales.
Here are the seven notes of a G Major Scale plus the octave:
G – A – B – C – D – E – F# – G
Here are the seven chords of a G major Scale built on each successive scale tone by skipping every other note along the scale :
Here are those chords with their respective scales:
By organizing the diatonic chords of a G major scale using the cycle of fourths, a harmonically meaningful seven-chord progression results called, “Natural Order.”
The natural order of chord modes (1-4-7-3-6-2-5-1) demonstrates the harmonic function of modes in actual chord progressions. It has a song-like quality and shows how a major scale naturally harmonizes itself. Many classical as well as jazz music compositions follow this pattern. For example, the “Prelude in C” by Johann Sebastian Bach from “The Well-Tempered Clavier” and in jazz, Jerome Kern’s, “All the Things You Are.”
Natural Order scale practice study:
From the book, “Straight Ahead Jazz For Banjo” by Pat Cloud