Notes:

Let it Grow is another study in enharmonic modes–modes that are made up of the same notes, but played over a different chord and key center. It starts off with 16 bars of D mixolydian, and then drops into the darker sound of A dorian for 32 bars. You can keep using the same scale over both, but notice how the tonal center changes (from D to A), and the different vibe that it takes on at that point.

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