Okay, the title may seem really confusing, but this is what it is:
This post is about how to create fourth structures (harmonies built on intervals of fourths) with four notes.
To read the cheat-sheet below, take a melody note and decide what function is it in relation to the chord. Then, you add three remaining chord member notes below it. Finally, you analyze the chord in relation to the melody note being the tonic:
So, say that I have the note A, and I want it to be the m3 of a chord:
Because A is the m3 of the chord, that means the notes below it (from highest to lowest) are E as the b7, B as the 11, and F# as the root 1. We can thus analyze this as vi 11 in the key of A major:
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