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78.39Level 21 — parallel upper-structure triads
Over C pedal:
D major triad:
D-F♯-A.
Move to:
E♭ major:
E♭-G-B♭.
Then perhaps:
E major:
E-G♯-B.
This is planing.
But now focus on:
D→E♭→E
F♯→G→G♯
A→B♭→B.
Three parallel semitone lines.