Is Jazz Theory Only for Jazz? I Transcribed a Pop Ballad and Found All of It
Jazz theory is not a jazz dialect — it's the grammar underneath most music you already listen to. Junewon Choi found this out the hard way: he sat down to transcribe a Korean pop ballad, expecting simple pop harmony, and found the melody targeting the 3rd of every chord and using 7ths as passing tones, exactly the way a jazz musician would. The same voice leading he teaches in his online jazz guitar lessons at VoiceLid Jazz Guitar was already in the song. Whoever wrote it either knows jazz or arrived at the same place by ear.
That's the useful realization for anyone wondering whether this study is worth it. You're not learning a genre. You're learning how melody and harmony fit together in nearly all music written after the blues.
What exactly showed up in the pop song?
Chord by chord, the melody landed on the 3rd. Over A♭Maj7 the melody sat on C. Over Gm7 it sat on B♭. Over Cm it sat on E♭. Where it didn't target the 3rd, there was a reason — over a B♭sus4 there is no 3rd to target, so the melody went to the 5th, and the 4th-and-5th cluster gave the chord its sound.
The 3rd is the target. It says major or minor, and melodies land there because that's where the chord's identity lives.
The 7th is usually the passing tone. Gm7's F wasn't a destination; it was the road to the destination.
Encircling shows up too — the melody circling above and below before landing on the 7th of A♭Maj7.
Tension replaces repetition. When landing on C again would have been dull, the writer used the 9th instead.
Modal interchange in the bridge — ♭VI major 7, minor v — voiced on a soft mallet-like keyboard so it never sounded strange.
None of that is unusual for jazz. All of it is unusual to notice in a pop ballad, which is exactly the point.
Then what is a harmony class actually for?
Here's a thing Berklee students figure out over drinks rather than in the classroom: harmony class doesn't teach you to improvise. It teaches you to compose. Those are different skills that use overlapping vocabulary, and confusing them is why a lot of players finish a theory sequence and still can't play through changes.
Voice leading is the bridge between the two. Every composer uses it — they have to, or their inner parts sound broken. But knowing it on paper and having it under your fingers, in your ear, at tempo, are separate achievements. Learning it at the instrument, hearing it as you play it, is what turns written knowledge into something you can improvise with. If you want an honest read on where you currently stand between those two, start with the Scorecard.
Why is the guitar the hardest instrument to standardize this on?
Because a single pitch exists in up to six or seven places on the neck. On the staff, that note has one home. On the piano, one key. On the guitar, you have choices, and every guitarist makes different ones.
In a big band, the trumpet section rehearses to match articulation exactly — where to turn a note, how to shape it, all identical. A guitar section can't do that, because two players executing the same melody in different positions will slide where the other pulls off. It's a real limitation, and it's part of why guitar pedagogy has never standardized the way horn or piano pedagogy has. It also means the fretboard logic you adopt matters more on this instrument than on any other.
For a related look at how listening shapes what you can even play, see What You Play Is What You Listen To.
What if I'm following all this and still feel stuck?
Then it's probably not a note problem. There are only twelve pitches — nobody is going to hand you a thirteenth. What separates the music that came out of America from European classical tradition isn't the notes; it's the blues and it's rhythm. That's where the innovation happened and that's where it still lives.
So when the harmony feels like it's closing in, the answer isn't more theory. Go back to blues. Go back to rhythm. Play fewer notes with better time. It works more often than another chapter of analysis will.
For how transcription trains that directly, Transcription Over Licks: What You're Really Copying Is Time Feel makes the case.
How should I read a course, or a book, or any of this?
One pass through, not one page at a time. If something in chapter two doesn't land, keep going. Come back. It lands on the second or third pass, and the moment it clicks is different for every person — which is why nobody can tell you in advance which section will be your hard one.
No swimming coach makes you run laps until you're fit enough to enter the water. You get in, you're bad at it, and you get better by being in there. Music is the same. Play the tune badly, then play it less badly.
If you want that path laid out from the first step, Essential: Building Blocks is the entry point — chords, voice leading, and the ear training that ties them together, in the order they actually build.
About the Author
Junewon Choi is a Berklee-trained jazz guitarist and the founder of VoiceLid Jazz Guitar, an online education platform teaching jazz harmony and improvisation through the Functional Diagonal Approach (FDA) — a chord-first method built on voice-leading rather than scale boxes.
Wes' Insight — Wes Montgomery's fretboard logic, in lesson form
Fundamental 1: Wes Diagonal System — the FDA from the ground up