Sprint 1 Focus Card — Gate Di-Chords: The Third Family

R1_focus_card_3_4  |  AMF Interval Training
[3]
Minor 3rd dark
Pulsation family: modal  4 Hz
wave shape:
F/O factor fundamental harmonicity non-harmonic shape rounded, shadow-left
Warm, inward, slightly heavy. The color of minor chords — sadness, depth, gravity pulling down.
Sing: “Hey Jude” opening fall → name it [3]
[4]
Major 3rd light
Pulsation family: modal  4 Hz
wave shape:
F/O factor fundamental harmonicity harmonic shape rounded, shadow-left
Bright, open, upward lift. The color of major chords — joy, clarity, light rising.
Sing: “When the Saints” first leap → name it [4]

Why these two first

[3] and [4] encode the major/minor quality distinction — the single most foundational contrast in Western harmony. Every chord, every key, every mood decision hinges on this one semitone difference. Learn to hear it reliably and all other intervals follow naturally.

Both are modal (4 Hz) — feel the same gentle wave in each. The waviness is identical. The difference is color only: dark minor [3] vs. light major [4]. Same rhythm, opposite quality.

Practice loop
👂 Hear
→
🎵 Sing
→
[n] Name