one of the easier ways of thinking...
Is just to go back to triads...
All of the chord extensions can be covered by this approach. For example, take a C major chord (C-E-G). Play an Em minor triad (E-G-B) over it and you have a C maj 7th in combined sounds (same with 9th G maj, 11th B dim and 13th D minor). Its just another way of thinking regarding chord extensions by stacking triads.
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A bunch of nice archtops, flattops, a gypsy & nylon strings…
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