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<h1>Chromatic Scale</h1>
<p>The chromatic scale contains all twelve pitches within an octave, each a half step apart. It's not a scale you improvise in — it's the complete inventory of available pitches in equal temperament. Understanding it means understanding the total harmonic space. In practice, chromatic passing tones and chromatic approach notes are fundamental tools in jazz, blues, and classical phrasing — notes that move between scale tones to create smooth, connected lines.</p>

<h2>Construction</h2>
<pre>
C chromatic scale (ascending — use sharps):
C — C# — D — D# — E — F — F# — G — G# — A — A# — B — C

C chromatic scale (descending — use flats):
C — B — B♭ — A — A♭ — G — G♭ — F — E — E♭ — D — D♭ — C

12 notes, 12 half-step intervals.

Enharmonic equivalents (same pitch, different name):
  C# = D♭    D# = E♭    F# = G♭    G# = A♭    A# = B♭

Use sharps ascending and flats descending — conventional notation,
not a rule about which pitches to use.
</pre>

<h2>Chromatic Passing Tones</h2>
<p>The most common use of chromatic notes: fill the space between diatonic scale tones to create smooth, connected lines:</p>
<pre>
Diatonic line from C to E (major third):
  C — D — E    (three notes, two whole steps)

With chromatic passing tones:
  C — C# — D — D# — E   (five notes, four half steps)
  or
  C — D♭ — D — E♭ — E   (same pitches, different spelling)

The chromatic version fills every half step between C and E —
smoother, more connected, a "slide" rather than a "skip."

In jazz improvisation: passing tones connect chord tones.
Moving from the ♭3 (C) to the major 3rd (E) of an A major chord:
  C → C# → D → D# → E  — chromatic approach to the target
</pre>

<h2>Chromatic Approach Notes</h2>
<p>A single chromatic note placed a half step below or above a target chord tone, just before landing on it. This is a core bebop and blues phrasing device:</p>

<table>
  <thead><tr><th>Approach type</th><th>Example (target = E, major 3rd of C)</th><th>Character</th></tr></thead>
  <tbody>
    <tr><td>From below (half step)</td><td>E♭ → E</td><td>Tension then arrival — most common</td></tr>
    <tr><td>From above (half step)</td><td>F → E</td><td>Diatonic approach (also common)</td></tr>
    <tr><td>Double chromatic from below</td><td>D# → E♭ → E (or just E♭ → E)</td><td>Stronger setup, two half steps below</td></tr>
    <tr><td>Double from above then below</td><td>F → E♭ → E</td><td>Surrounding the target — enclosure</td></tr>
  </tbody>
</table>

<pre>
"Enclosure" technique (surrounds the target note):
  Target: G (5th of C major chord)
  Enclosure: A♭ → F# → G  (one above, one below, then target)
  or:        F# → A♭ → G  (reversed)

Charlie Parker used enclosures constantly — the note "falls into"
its target after being surrounded chromatically.
</pre>

<h2>Bebop Chromatic Lines</h2>
<p>In bebop, chromatic connecting tones allow fast eighth-note lines to keep chord tones landing on strong beats even when starting on non-chord tones. The result sounds harmonically coherent at high tempos:</p>
<pre>
Over Cmaj7 (C E G B), starting on D:
Without chromatic:  D E F G A B C D — scale tones only
                    Chord tones land on: E(beat 2), G(beat 3), B(beat 4) ✓

Adding chromatic connection:  D D# E F# G G# A B C
                              chord tones: E(beat 2-ish), G, B — still aligned

Charlie Parker's genius: every fast line has a structure underneath it —
chord tones on strong beats, chromatic notes as connective tissue.
</pre>

<h2>Chromatic Voice Leading</h2>
<p>In chord melody and arranging, moving inner voices by half step between chords creates tension that resolves beautifully when the next chord lands:</p>
<pre>
Dm7 → G7: inner voice E♭ → D (descending half step into chord tone)
Cmaj7 → Am7: inner voice B → B♭ would be non-diatonic — instead B → A
               (not chromatic, but the principle is smooth stepwise motion)

Ted Greene's chord melody approach uses chromatic inner voice movement
extensively: the melody may move by step, bass by large interval,
and the inner voices fill in chromatically — creates dense, layered texture.
</pre>

<h2>The Twelve-Tone Technique</h2>
<p>Schoenberg's twelve-tone (serial) technique requires all twelve chromatic pitches to appear before any repeats — creating a non-hierarchical equality among all pitches. No pitch is the "tonic"; all twelve have equal status. This is the opposite of tonal music's hierarchy. The chromatic scale as a complete inventory — rather than a resource to draw passing tones from — is the starting point of this compositional approach. Webern, Berg, and later composers (Boulez, Stockhausen) extended it.</p>

<h2>Chromatic Scale in All Keys</h2>
<p>There is only one chromatic scale — it contains all twelve pitches. The "key" you start on just changes the order of presentation. C chromatic scale and G chromatic scale are the same twelve notes in the same order, just starting from a different point.</p>

<h2>References</h2>
<ul>
  <li>Levine — <em>The Jazz Theory Book</em></li>
  <li>Coker — <em>Improvising Jazz</em></li>
  <li><a href="https://www.musictheory.net/lessons/20" target="_blank" rel="noopener">musictheory.net — Chromatic Scale ↗</a></li>
</ul>
