Kaplan Chord Spacetime

AUG 24, 2025

Song: Sledgehammer by Peter Gabriel

I’ve been playing music for about fifty years, and only recently did I realize how strange the teaching of chords looks once you compare it to what actually happens in music. On guitar, it’s a left-hand shape—some strings fretted, some open, some muted—strummed all together as a block. On piano, it’s the same idea: stack your fingers, press down, and hold. That’s the chord. Perfectly normal, supposedly. Of course there are other ways taught that don’t involve playing all notes simultaneously such as arpeggios. What I find strange is the fact that this “all notes at once” way of playing even exists, much less being treated as the default.

Imagine if a drummer approached the kit with the same mindset. Two hands and two feet, all striking together on nearly every beat. It would sound mechanical, freakish—like a broken robot is playing who needs to be rebooted. In practice, drummers almost never do this. Four limbs at once is rare, three is occasional, and most of the time it’s one or two sounds, with space between them. That’s how rhythm breathes. Yet on guitar and piano, the opposite expectation has taken hold: you’re handed a shape, told to hit everything at once, and that stacked block is treated as the chord.

That’s where Kaplan Chord Spacetime comes in. I don’t think of a chord as a frozen block of sound. I think of it as a span in which certain tones exist and unfold—some briefly, some held, some left out entirely. The chord symbol shows the spacetime: these are the notes the harmony leans on, but they don’t have to arrive together or stay put. They move through, like actors stepping on and off stage. The chord isn’t the grip. The chord is the unfolding inside its spacetime.

Some notes almost always make an appearance. The root usually shows up, or else the harmony feels unmoored. The fifth is nearly always safe—sometimes dropped, but rarely out of place. The third is trickier. In a plain “C” chord, the E may or may not be there; the music decides. But if the symbol says “Cm,” then the E-flat is almost guaranteed at some point, because that’s the sound the symbol insists on. Jazz chords work the same way. If the chart calls for C7 or C9, you can pretty much expect the seventh or ninth to surface somewhere in the measure. Extensions don’t have to ring constantly, but their presence shapes the spacetime and gives the chord its identity.

Chords aren’t blocks to be dropped but spacetimes to be inhabited. Some tones anchor, some color, some flicker for only a moment—but none of it is static. That’s the sound of real music.

#MusicTheory #Musiceducation #Harmony