Guitar? Three Upper Structures Over One ii-V-IWhat Is Superimposition on Jazz
Superimposition means the band is playing one set of changes underneath while you play a different, higher set on top. Concretely: over a Cm7 – F7 – Bbmaj7, the bassist and pianist play exactly that, and you play Ebmaj7 – F# minor – Gm. Same harmony, one layer up. I'm Junewon Choi, a Berklee-trained guitarist, and in the online jazz guitar lessons at VoiceLid Jazz Guitar this is where upper structures stop being trivia and become a way to solo — because each of those three shapes is simply the original chord with its root removed and the resolution made chromatic.
Where do those three shapes come from?
Remove the root and read the chord from the 3rd:
Cm7 → C, Eb, G, Bb. Drop the C and you have Ebmaj7 as the upper structure.
F7 → F, A, C, Eb. Read from the 7th and you get Ebmaj7(b5); read from the 3rd on a dominant and you get m7b5. Both are standard dominant upper structures.
Bbmaj7 → Bb, D, F, A. Drop the Bb and from the 3rd you have a Gm sound.
So the "exotic" superimposition is three rootless voicings you can already finger. The altered version of the middle chord is the only addition: instead of Ebmaj7(b5) over F7, play the minor a half step above the dominant's root — F# minor. Now every voice in the middle chord is a half step from the Gm you're about to land on, and the line connecting them is a Django Line shape moving diagonally rather than a position shift. The fretboard geometry behind that diagonal is what Fundamental 1: Wes Diagonal System maps out.
Why does the altered sound reduce to "minor a half step up"?
Because a dominant's altered sound and the melodic minor a half step above its root contain the same notes. That's not a shortcut around the theory — it is the theory, stated in a shape you can transpose in one fret. Over F7, F# minor. Over D7, Eb minor. On a dominant seventh you also have the two plain upper structures worth memorizing:
From the 3rd: a m7b5 shape (F#m7b5 over D7 — which is just a rootless D9)
From the 7th: a maj7b5 shape
Take a G-major blues: on the D7 going home to G, an F#m7b5 gives you the natural-tension dominant; raise the G tonic's own voicing a half step instead, and you get the altered dominant that resolves chromatically down into it. Two different intentions, one fret apart.
How do I know which tension is allowed?
The melody tells you — this is the guardrail, and without it superimposition turns into guessing. Harmony supports the melody; the melody does not serve the harmony. On Stella by Starlight, I'll play a G major triad over a dominant, producing a b9, and it works precisely because the melody is sitting squarely on the 13 at that moment: the two coexist in different registers. Move to a plain Fm → Bb7 where nothing in the melody suggests it, add a b13 there, and it sounds like a chart being read out loud. A Bb13 in another spot was fine only because the previous bar had already introduced that Db through a tonic diminished sound.
What has to be in place before you superimpose?
Chord melody. You need to have played the tune as harmonized melody first — melody on top, guide tones underneath, advanced voicings worked out bar by bar — because that's what tells you where the melody actually lives. Superimposition is a layer you add on top of that knowledge, not a substitute for it. This is also why I'm skeptical of licks: a lick is a progression with no melody attached, and tension choices made without a melody are arbitrary by definition. For the general framing of playing your own changes over the band's, see What Is Superimposition? Playing Your Own Changes Over the Band's.
How do I practice this without it collapsing mid-tune?
Slowly, and always attached to a real song. Comp the ii-V-I as blocks: Ebmaj7, F# minor, Gm. Then run each block as a line so the last note lands on the target. Then play the tune's melody and find the spots where the melody already supports the altered sound — those are the only places you deploy it at first. Add a spot per week. For the shape-level version of getting the altered sound without the scale, read How Do You Get the Altered Sound Without the Altered Scale?.
The full progression from shell voicings through drop 2 and upper structures is the Bridge Series at https://www.voicelidjazzguitar.com/bridge-series.
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