What Are You Actually Playing?
The architecture of music
For years I learned guitar arrangements the way most people do. I found transcriptions and arrangements of tango and bossa nova music, I read the tab, I memorised the shapes, and I worked through each piece bar by bar until I could play it from memory.
I could see the chord grips on the page. I could even name some of them. But I didn’t know what they were doing — I didn’t know which chord was functioning as the dominant, where the cadences were, why one passage sounded rich and colourful while the next passage sounded flat and ordinary. I was playing the notes without understanding the architecture of the piece.
And because of that, I was stuck. I couldn’t fix the parts that didn’t work. I couldn’t fill the gaps where the melody jumped awkwardly. I couldn’t make informed choices about voicings or embellishments. I was entirely dependent on whoever had written the arrangement, and I had no way to evaluate whether their choices were good ones.
When I eventually started studying jazz harmony — not as an academic exercise, but as a way to understand what was actually happening in the music I was playing — everything changed. Pieces I thought I knew revealed harmonic structures I had been playing without hearing. Inconsistencies I had accepted as normal turned out to be problems I could solve. And arrangements that had felt like fixed texts became starting points for my own interpretation.
This is the difference that harmonic understanding makes, and it affects everything from the consistency of your sound to your ability to adapt, embellish, and eventually create your own arrangements.
The first thing you notice when you start analysing arrangements harmonically is inconsistency. Commonly you will find passages with a rich and extended harmony — sophisticated voicings, colourful tensions, interesting voice leading — followed immediately by passages that sound fairly bland and generic. Basic triads or simple seventh chords sitting next to major 6/9 or dominant #11, with no apparent awareness that the contrast creates an imbalance.
A classical guitarist arranging a Piazzolla piece will handle the jazz chords given in the lead sheet faithfully, but default to conventional classical voicings wherever the harmony is left to interpretation. If you don’t understand the harmonic structure, you have no way to recognise the imbalance. You might like it or not. But if you don’t, you’re basically stuck with what’s on the page.
Another common problem is technical. Arrangements that combine chords with melody — whether in a classical texture or a chord-melody approach — often create situations where the chord voicing and the melody note are physically distant on the fretboard. The bass note of the chord is down in first position while the melody note is up at the seventh fret on the first string, and your hand simply cannot bridge the gap.
If all you know is the tab, your only option is to make the stretch or accept the gap. But if you know what chord you’re playing, you have options. You can arpeggiate the chord and run a connecting line up to the melody note. You can use a different voicing of the same chord that sits closer to the melody. You can insert a brief single-note fill that outlines the harmony and arrives at the melody note through voice leading rather than a leap.
All of these solutions require one thing: knowing what the chord actually is, and understanding its function in the progression. Without that, you’re stuck with whatever the arranger gave you, whether it works for your hand or not.
Understanding the harmony of a piece begins with identifying the key and recognising the standard patterns within it. It’s good if you can find a lead sheet or an iRealPro Chord chart. But even if you find the chord progression, often you need to infer what’s going in the arrangement from the notes on the staff.
If a piece or section of music is in A minor, you are expecting to encounter certain chords: A minor as the tonic, B half-diminished as the ii chord, E dominant — usually E7♭9 or E7♭13 — as the V chord. You are looking for the ii–V–i cadence, because that is the engine that drives harmonic movement in most tonal music, and it will appear repeatedly throughout the piece.
If the piece is in C major, the same notes produce different functions. Now D minor is the ii chord, G dominant is the V chord, and C major is the I chord. The ability to recognise which key you are in at any given moment — and keys often shift within a piece — tells you immediately what role each chord is playing.
This is not abstract theory. It is practical information that changes how you hear and play the music.
When you look at a bar of notation and see a collection of notes that could be several different chords, the harmonic context suggests and interpretation. It might look like an A minor chord from the grip alone, but if it sits between a D minor and an E7♭9, it is probably functioning as the tonic in a iv–V–i cadence in A minor. Conversely, if the same notes appear between F major and G7, you are probably looking at a vi chord in C major.
The grip is the same. The function is completely different. And the function determines what you can do with it — what extensions are available, what substitutions work, what voice leading makes sense.
Once you can see the harmonic architecture of a piece, you stop being a passive reader and become an active interpreter. You can compare two different arrangements of the same tune and understand what each arranger was going for — a traditional sound or a modern one, a conservative approach or an extended one. You can identify the places where the harmony thins out and decide whether to enrich it. You can spot passages where the arranger defaulted to simple voicings and consider whether an extension or substitution would improve the line.
You can also adapt arrangements to your own technique. If the original relies on wide stretches that don’t suit your hand, but you know the chord and its function, you can find a different voicing that achieves the same harmonic result in a more comfortable position. If you are good at fast single-note runs but the arrangement is written in block chords, you can outline the same harmony melodically. The arrangement becomes a starting point rather than a fixed text.
Every genre has its own harmonic vernacular — its characteristic voicings, common progressions, and idiomatic grips in particular keys. As you study more pieces in a genre, you begin to internalise these patterns, and new pieces in the same idiom become easier to learn, memorise, and adapt.
The arrangements you play become conversations rather than recitations. You understand what the arranger intended. You can agree with their choices or improve on them. And this leads to something that most guitarists postpone far too long: writing your own arrangements.
The conventional assumption is that arranging is an advanced skill — something you work toward after years of studying other people’s work. I think this has it backwards. You should start creating your own arrangements as early as possible, because arranging is one of the most effective ways to learn harmony in the first place.
When you take a lead sheet and try to build a guitar arrangement from it, you are forced to make the decisions that were previously made for you. Which voicing of this chord? Which inversion puts the melody on top? Where does the bass note go? What connects this chord to the next one? These are not theoretical questions — they are practical problems that you solve with your hands on the fretboard, and each one deepens your understanding of how harmony works on the instrument.
Intros are an excellent way to get started. Take the last few bars of a piece and adapt them into an introduction — this is a standard technique in tango and bossa nova arranging, and it gives you a contained problem to solve: just four or eight bars of music where you need to establish the key, set the harmonic mood, and arrive at the beginning of the tune. Listen to recordings and notice how performers handle their intros — sometimes it is a simple melodic line over the dominant chord, sometimes it is a more elaborate harmonic setup. Then try writing your own. A few bars of arranging teaches you more about a piece than another ten repetitions of someone else’s version.
Another useful exercise is to take an arrangement you already know in one key and rearrange it in a different key. The same harmonic structure produces different voicing options, different open-string possibilities, different physical challenges. You quickly discover that an arrangement is not a fixed object but a set of harmonic choices, and that the same progression can be realised in many different ways depending on the key and the voicings you select. Comparing your version with the original — or with someone else’s arrangement of the same tune — is where real learning happens. You see what they chose, what you chose, and you start to understand why.
A deeper point here is that improvisation is essentially just arranging on the spot. When a musician improvises over a chord progression, they are making the same decisions an arranger makes: which notes to play over this chord, how to voice-lead into the next one, where to place the tensions, how to connect the melody to the harmony. The difference is speed. An arranger works these things out at a desk; an improviser does it during the performance. But the underlying skill is the same — a fluent understanding of the harmonic options available at any given point in a tune.
So the more arrangements you write, the more fluent you become with the harmonic vocabulary of the music you play. And as that fluency develops, the gap between working something out on paper and generating it spontaneously on the instrument begins to close.
That is what studying harmony gives you. Not just theoretical knowledge, but practical freedom on the instrument.
I publish solo guitar arrangements and studies with full harmonic analysis — standard notation, TAB, chord symbols, and Roman numeral analysis. Browse the catalogue on Payhip, or subscribe here on Substack for more on tango and bossa nova harmony.