The Architecture of Musical Thought: Advanced Harmony and Polyphony
At the advanced level, the guitar is no longer viewed as an instrument of “chords,” but rather as a miniature orchestra. To master this stage, the musician must understand how notes outside the scale (chromaticism) create color and direction, and how multiple melodies can coexist without overshadowing one another.
1. Chromatic Harmony: The Spectrum of Color Beyond Black and White
Diatonic harmony (using only notes within the key) is stable and safe, but chromatic harmony
is where the drama and sophistication of the Romantic and Modern periods reside.
Secondary Dominants and Directional Tension
A secondary dominant is an “intruder chord” that serves to announce the arrival of a chord other than the tonic.
- Application: Instead of going directly from C to G, you play a D7 (V of V). On the guitar, this creates a more compelling bass line and an auditory expectation that “pushes” the music forward.
Sixth Chords (Neapolitan and Augmented)
These are the “exotic spices” of classical harmony:
- Neapolitan Sixth (bII): Imagine you are in A Minor. A Bb Major chord (the lowered second degree) creates a profound, solemn impact—often used for moments of tragedy or supplication.
- Augmented Sixths (Italian, French, German): These chords contain an augmented sixth interval (e.g., F natural to D#) that resolves outward to an octave (E and E). On the guitar, the challenge is the fingering; these chords often require stretches that test your ergonomics (Lesson 1).
2. Complex Modulations: Traveling to Distant Worlds
Modulating is changing the tonal center (the “home”) of the piece. While simple modulations use a common pivot chord, complex ones use mathematical and acoustic shortcuts.
The Magic of Enharmonization
Enharmonization occurs when a note changes its name but keeps its pitch (e.g., G# is the same as Ab).
- The Diminished Seventh Chord: This is the “wildcard” of modulation. A diminished chord is symmetrical (built on minor thirds). On the guitar, you can move the same chord shape three frets up, and it remains the same chord but with a different note in the bass. This allows you to exit one key and “land” in a completely distant one with elegance.
Mediant Relationships (Thirds)
Moving from C Major to Eb Major creates an immediate “color shift,” a technique heavily explored by Beethoven and Schubert. For the guitarist, this requires a quick mental shift regarding which open strings can be used, as the new key may not favor the instrument’s natural basses (E, A, D).
3. Counterpoint: Total Finger Independence
Counterpoint is the art of combining independent melodies. On the guitar, this means your thumb is the cellist, and your i, m, a fingers are the violinists or flautists.
The Challenge of Voice Leading
Unlike a piano, where you have ten fingers, on the guitar, you have four fingers on each hand to manage multiple lines.
- The Principle of Economy: To keep three voices ringing clearly, the secret is minimal movement. If a middle voice can remain stationary while others move, leave it there.
- Avoiding Parallelism: In classical theory, moving two voices in parallel fifths or octaves strips them of their independence. Good counterpoint seeks contrary motion (one voice ascends while the other descends).
4. Orchestral Reduction: The Guitar as Microcosm
Reducing a symphony for the guitar is an act of musical curation. You cannot play all 20 notes of an orchestra, so you must play the 3 or 4 that define the essence of that moment.
- Prioritize the Extremes: The highest melody and the lowest bass must be present; they form the “frame” of the music.
- Guide Tones: Within the chord, the 3rd (which defines major or minor) and the 7th (which provides movement) are more crucial than the 5th.
- Idiomatic Writing: If the orchestra has a rapid violin passage, a slur or a fast arpeggio on the guitar might work better than trying to pick every single note.
Summary
Advanced theory doesn’t stifle creativity; it unlocks it. Understanding Modal Mixture (like why F minor sounds good in C Major) gives you the freedom to evoke specific emotions at will. Understanding Enharmonic Modulation turns the fretboard from a linear tool into an infinite cycle of possibilities. Advanced technique (Lesson 9) provides the strength, but advanced theory provides the intelligence to know where to apply it.
Try This
Try this classic progression in C Major, which utilizes the minor iv (Fm) borrowed from the key of C Minor (Modal Interchange):
- C (C Major): The bright, stable home.
- F (F Major): The natural fourth degree.
- Fm (F minor): The “secret sauce.” Feel how the A note dropping to Ab creates a dramatic, sophisticated tension.
- C (C Major): The return home, resolving the tension.