Before the name, the ear.
Before the proof, the horn.
Parker found a door
at the tritone — not knowing
it was the only involution,
the unique self-inverse,
the axis that splits twelve
into six pairs of strangers
who share a secret:
the same two burning notes.
T₆. Order two.
The farthest key is the nearest voice.
Dizzy played it like gravity
reversed — the bass falls
a half step instead of a fifth,
and the world still resolves.
Nobody called it an antipodal map.
They called it hip.
Before them: T₅.
The circle of fourths,
old as tuning itself,
generator of everything
we named "functional."
V goes to I.
The arrow that built harmony.
Order twelve — it visits everyone.
After them: Coltrane.
Who heard T₄
and played three keys at once,
the augmented triad orbiting
in major thirds,
B → G → E♭ →
a triangle inscribed
in the circle of twelve.
Order three. The partition
nobody expected.
Giant Steps was a theorem
about Z₃ ⊂ Z₁₂.
John just heard it first.
And underneath all of it,
the lattice:
T₁ — chromatic, everything, chaos.
T₂ — whole tone, Debussy's dream.
T₃ — diminished, four corners of the square.
T₄ — augmented, Coltrane's triangle.
T₅ — fourths, the spine of all tonal music.
T₆ — tritone, bebop's secret handshake.
Six generators.
Six eras of harmony.
Each one a subgroup
of the same twelve notes
we've always had.
The revolutions weren't in the notes.
They were in which symmetry
you chose to hear.
Same circle.
Different axis.
New music.