Lesson 62 · All 12 keys

Tone Cluster Trainer

Learn how a Tone cluster is built one semitone-count at a time — three adjacent notes struck together — a half step and a whole step stacked right on top of the root, with no 3rd, 5th, or 7th at all — then put it to work with three MIDI exercises: playing all 12 tone clusters around the circle of fourths, and 5 jazz plus 5 gospel chord progressions that show off its color, in every key.

How a Tone cluster is built

A Tone cluster — written cluster (e.g. Ccluster) — is a 3-note chord: three adjacent notes struck together — a half step and a whole step stacked right on top of the root, with no 3rd, 5th, or 7th at all. Every cluster chord — in any of the 12 keys — is built the exact same way, by counting semitones to the right from a root note:

  1. The starting note — this note names the chord.
  2. Count 1 semitone up from the root — the minor 2nd, right next door to the root.
  3. Count 1 more semitone up from the minor 2nd (2 semitones from the root) — the major 2nd.
Example — Ccluster: start on C, count 1 semitone right to reach D♭, count 1 semitone more to reach D. C‑D♭‑D is the Ccluster chord.
A tone cluster is not meant to resolve or function like a normal chord — it is a percussive hit, usually struck briefly for a dramatic gospel accent rather than sustained as a harmony. (A wider version, spanning a major 3rd — 0, 2, 4 — is common too.)

Try it: pick a root and build the chord step by step

Step 1 of 3
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Chord toneNoteSemitones from rootMIDI #

All 12 tone clusters at a glance

ChordRootMinor 2ndMajor 2nd

This MIDI exercise plays all 12 tone clusters, one after another, moving around the circle of fourths — each chord's root sits a perfect 4th (5 semitones) above the last one: C → F → B♭ → E♭ → A♭ → D♭ → G♭/F♯ → B → E → A → D → G → back to C. Every chord is played as a full 3-note Tone cluster (root, minor 2nd, major 2nd together).

Chord 1 of 12
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The 12 chords, in circle-of-fourths order

#ChordRootMinor 2ndMajor 2nd

Five jazz chord progressions built around the Tone cluster. Pick a progression and play it in one key or cycle through all 12.

Key of C
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Progression in C

DegreeChordNotes

Five gospel chord progressions built around the Tone cluster. Pick a progression and play it in one key or cycle through all 12.

Key of C
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Progression in C

DegreeChordNotes