The chords in Billie Eilish & FINNEAS' "Halley's Comet" are gorgeous -- and baffling! Let's peek under the hood: the minor 6 (flat sixth) & half step motions that make the chord progressions so emotionally subtle, complex, & satisfying.

This is more than "music theory" or "harmonic analysis": it's a practical mental model to connect your emotional creativity to concrete musical chords.

I came up with all the concepts & insights from this video with Michelle McGhee, who's co-producing this entire series with me.