9.3 Four-part writing

Four-part writing is the backbone of harmonic progression in Western music. It's all about balancing four distinct voices - soprano, alto, tenor, and bass - to create rich, flowing harmonies. Think of it as a musical puzzle where each voice has its own role.

In this chapter, we're diving into how chord inversions and voice leading work together in four-part writing. You'll learn how to move smoothly between chords, avoid common pitfalls like parallel fifths, and create progressions that sound both balanced and interesting.

Rules of four-part writing

Voice distribution and clefs

• Four-part writing involves composing for four distinct voices: soprano, alto, tenor, and bass
• The soprano and alto voices are typically written in the treble clef (G clef), while the tenor and bass voices are written in the bass clef (F clef)
• Each voice should have a distinct melodic line that is singable and easy to follow

Harmonic and voice leading principles

• The voices should work together harmonically, creating a cohesive and balanced sound
• There are specific rules for voice leading to maintain proper sound and flow:
  • Avoid parallel fifths and octaves between any two voices
  • Maintain proper spacing between voices to ensure clarity and independence
  • Use contrary motion, where voices move in opposite directions, to create balance and avoid parallel motion
• Chords in four-part writing are typically written in root position, first inversion, or second inversion, depending on the context and desired effect (cadential 6/4, passing 6/4, pedal 6/4)
• The choice of chord inversions can affect the overall sound and flow of the harmonic progression

Composing four-part progressions

Establishing a strong bass line

• The bass voice often establishes the foundation of the harmonic progression and should have a clear, logical direction
• Use chord inversions strategically to create a smooth bass line and to maintain proper voice leading
• The choice of chord inversions can also be used to emphasize certain notes or to create specific musical effects (bass pedal point, dominant pedal)

Efficient voice leading in upper voices

• When composing four-part harmonic progressions, follow the established rules of voice leading to create a smooth and logical flow between chords
• The upper voices (soprano, alto, and tenor) should move efficiently from chord to chord, avoiding large leaps when possible
• Contrary motion between voices is often used to create a sense of balance and to avoid parallel motion
• Resolve tendency tones properly (leading tone resolves to tonic, chordal seventh resolves down by step)

Identifying errors in four-part writing

Parallel fifths and octaves

• Parallel fifths occur when two voices move in perfect fifths in the same direction, creating an undesirable sound that lacks independence between the voices
• Parallel octaves occur when two voices move in perfect octaves in the same direction, creating a similar lack of independence and a doubling effect
• To identify these errors, analyze the motion of the voices and check for consecutive perfect intervals
• To correct parallel fifths and octaves, adjust one or both of the voices involved to create a different interval or to move in a different direction

Other common errors

• Unresolved dissonances: Dissonant intervals (seconds, fourths, sevenths) should be properly prepared and resolved
• Improper treatment of leading tones: Leading tones should resolve to the tonic and should not be doubled
• Incorrect doubling of chord tones: In general, double the root, then the fifth, and avoid doubling the third or seventh
• Spacing issues: Avoid large gaps between adjacent voices (no more than an octave between soprano and alto, and alto and tenor)

Analyzing four-part writing in music

Identifying key elements

• When analyzing four-part writing, identify the key elements such as:
  • Harmonic progression: the sequence of chords used
  • Voice leading: how individual voices move from chord to chord
  • Use of chord inversions: how inversions are used to create smooth voice leading or specific effects
• Consider the musical context, such as the genre, style period, and composer's intentions

Comparing and contrasting examples

• Four-part writing techniques can be found in various musical genres and styles (classical, romantic, contemporary choral, hymns)
• Comparing and contrasting different examples of four-part writing can help identify common techniques and stylistic differences across various genres and time periods
• Analyze how the four-part writing contributes to the overall musical effect and expression of the piece

Creating original four-part progressions

Developing a harmonic plan

• When creating original progressions, start with a clear harmonic plan, including:
  • Key: the tonal center of the progression
  • Meter: the time signature and rhythmic feel
  • Desired musical style or effect: the overall mood or character of the progression
• The progression should have a logical flow, with chords that are functionally related and create a sense of movement towards a resolution (tonic-predominant-dominant-tonic)

Applying voice leading principles

• Use proper voice leading techniques to create a smooth and balanced sound:
  • Contrary motion: voices moving in opposite directions
  • Efficient voice movement: minimizing large leaps in individual voices
  • Proper resolution of tendency tones (leading tone to tonic, chordal seventh down by step)
• Employ chord inversions strategically to maintain proper voice leading, create specific musical effects, and provide variety in the bass line

Demonstrating mastery

• The original progression should demonstrate a clear understanding and application of the principles of four-part writing
• The result should be a musical example that is both technically sound and artistically expressive
• Ensure the progression follows the established rules of voice leading, harmonic function, and chord inversions
• Create a progression that showcases creativity and musicality within the constraints of four-part writing conventions