Teach & case

A real case · you decide

Jae and the chord that "sounds happy"

Jae — a student arranger labeling chords for the school band who keeps guessing quality by how each one "feels"

The idea in play: determining chord quality from the third (a major vs minor 3rd) rather than from how it "feels".

Jae is labeling chords in a score. One "sounds happy," so Jae writes major; another "sounds sad," so minor. But the conductor plays a bright, up-tempo minor chord that Jae swore was major, and a somber major chord in a slow passage that Jae called minor. Feel keeps misleading. What actually decides major vs minor?

Chord quality is fixed by the INTERVAL from the root to the third: a major 3rd (4 half-steps) makes it major; a minor 3rd (3 half-steps) makes it minor. That's a countable fact about the notes, independent of tempo, dynamics, or mood.

"Happy" and "sad" are how a chord is USED — tempo, context, the melody over it — not what it IS. A major chord in a slow, quiet passage can sound mournful; a minor chord at 160 bpm can sound joyful. The third tells you the quality; the arrangement tells you the feeling.

Jae's fix is a two-second habit: before writing major or minor, find the third and count the half-steps. The feeling is for the audience; the interval is for the label.

Name a chord by its third yourself →