Getting Started
Writing music for four distinct voices, often called SATB writing, is a foundational skill in tonal harmony. It moves beyond simply identifying chords to arranging them in a musically coherent and historically informed way. This chapter focuses on two fundamental principles of this practice: how to distribute the notes of a chord among the voices (spacing) and which note to give to more than one voice when necessary (doubling).
What You Should Be Able to Do
Identify correct and incorrect chord spacing in a four-part texture based on standard conventions.
Detect errors in chord doubling, particularly concerning the root of the chord and tendency tones.
Spell and construct triads in a four-voice texture that adhere to established doubling procedures.
Analyze four-part scores to evaluate the composer's choices regarding chord voicing and doubling.
Complete musical excerpts by writing upper voices above a given bass line, applying correct spacing and doubling.
Key Concepts & Analysis
The conventions of four-part writing are guided by the goal of creating a texture that is clear, balanced, and sonorous. This is achieved by following specific constraints on how notes are arranged vertically. These constraints govern the voicing of a chord, which refers to the specific arrangement and spacing of its pitches across the different voices.
Chord Voicing and Spacing
In the context of four-part writing, the voices are designated Soprano (S), Alto (A), Tenor (T), and Bass (B), from highest to lowest. Spacing refers to the intervallic distance between these voices. Proper spacing ensures that the individual lines remain distinct while contributing to a cohesive whole.
The primary rule for spacing concerns the three upper voices: Soprano, Alto, and Tenor.
- The distance between adjacent upper parts (Soprano-Alto and Alto-Tenor) may be as far apart as an octave, but no more.
Maintaining this proximity prevents the texture from sounding thin or disconnected in the middle. For example, if the Alto sings a C4, the Soprano must sing a pitch no higher than C5. Similarly, the Tenor must sing a pitch no lower than C3.
An important exception applies to the lowest two voices:
- The distance between the Bass and the Tenor may be more than an octave.
This flexibility allows the bass voice to provide a strong harmonic foundation without overly constraining the tenor line. A large gap between the bass and the upper voices is common and sonically effective.
Example of Correct Spacing:
A C major chord could be voiced as follows:
Soprano: G4
Alto: E4 (a minor third below Soprano)
Tenor: C4 (a major third below Alto)
Bass: C3 (an octave below Tenor)
All upper voices are within an octave of each other. The Bass-Tenor interval is an octave, which is permissible.
Example of Incorrect Spacing:
A C major chord with incorrect spacing:
Soprano: G4
Alto: C4 (a perfect fifth below Soprano)
Tenor: E2 (more than an octave below Alto)
Bass: C2
The interval between the Alto (C4) and Tenor (E2) is a major tenth, which exceeds the one-octave limit.
Chord Spelling and Doubling
Most triads contain only three unique pitches (root, third, and fifth), but SATB texture requires four notes. This necessitates doubling, the practice of assigning the same pitch class to more than one voice. The choice of which chord member to double is not arbitrary; it follows a clear hierarchy designed to promote stability and smooth voice leading.
The most fundamental principle of doubling is:
- Double the root of a triad whenever voice leading allows.
The root is the most stable and acoustically important member of a triad. Doubling it reinforces the chord's identity and provides a strong, unambiguous sound. This is the default and most common practice for all major and minor triads in root position and first inversion.
However, this primary guideline is subject to a crucial restriction involving tendency tones. A tendency tone is a harmonically unstable note that implies a specific resolution, typically by step. The most prominent tendency tone is the leading tone (^7), which feels a strong pull toward the tonic (^1). Doubling a note with such a strong melodic pull can create voice-leading complications. Therefore, the following rule is critical:
- In all situations, always double non-tendency tones.
This means you should avoid doubling the leading tone. For example, in the key of C major, the V chord (G-B-D) contains the leading tone, B. When writing this chord in four parts, you should avoid doubling the B. The best choice would be to double the root, G.
Combining these principles gives us a clear procedure for building chords:
Spell the required triad (e.g., root, third, fifth).
Assign the bass note first.
Distribute the remaining notes among the upper voices.
To create the fourth note, double a chord member, prioritizing the root.
Check for tendency tones (like the leading tone) and ensure they are not doubled.
Verify that the spacing between adjacent upper voices does not exceed an octave.
Data & Organization Tools
The following table outlines the general priority for doubling notes within a simple triad. This hierarchy helps in making quick, effective decisions during analysis and writing exercises.
| Chord Member | Doubling Priority | Rationale & Common Usage |
|---|---|---|
| Root | 1 (Highest) | Reinforces the chord's identity and harmonic function. The default choice. |
| Fifth | 2 (Secondary) | A stable, neutral tone. A good alternative if doubling the root is awkward. |
| Third | 3 (Lowest) | Defines the chord's quality (major/minor). Doubling can create a thick texture. |
| Tendency Tones | Avoid Doubling | These notes (e.g., leading tone) have strong melodic pulls that are complicated by doubling. |
Evidence Bank
SATB Voicing: The specific arrangement, ordering, and spacing of notes within a four-part texture (Soprano, Alto, Tenor, Bass).
Chord Spacing: The intervallic distance between adjacent voices. Correct spacing is crucial for a balanced texture.
Open Spacing: A chord voicing where the upper three voices are spread out, often with more than an octave between the soprano and tenor.
Close Spacing: A chord voicing where the upper three voices are placed as close together as possible, with less than an octave between the soprano and tenor.
Doubling: The practice of repeating a chord member in a different voice, necessary when writing three-note triads for a four-voice texture.
Tendency Tone: A harmonically unstable note that implies resolution to a nearby stable tone. The leading tone (^7) is the most common example.
Root Doubling: The standard and most preferred procedure for doubling, where the root of the chord is stated in two separate voices.
Skill Snapshots
Functional: In the progression I–IV–V–I in G major, the I chord (G-B-D) and IV chord (C-E-G) would typically be written with their roots (G and C, respectively) doubled. The V chord (D-F#-A) contains the leading tone F#; therefore, its root (D) should be doubled to avoid voice-leading issues.
Voice-Leading:
Rule: The distance between the soprano and alto must not exceed an octave. Effect: This creates a cohesive upper-voice texture and prevents the sound from becoming hollow.
Rule: Double the root of the triad. Effect: This provides maximum stability and clearly establishes the chord's harmonic identity.
Rule: Avoid doubling the leading tone (^7). Effect: This prevents the creation of awkward or unresolved melodic lines, as a doubled tendency tone would create pressure for two voices to resolve in a similar, often problematic, manner.
Form: A simple phrase may be constructed to end on a V chord (a half cadence), creating a sense of expectation. A contrasting phrase might then follow the same harmonic path but end on a I chord (an authentic cadence), providing a sense of closure and completion. The principles of spacing and doubling remain consistent throughout both phrases to ensure textural continuity.
Common Misconceptions & Clarifications
Misconception: The spacing rule applies to all adjacent voices equally.
- Clarification: The rule that adjacent voices must be within an octave of each other applies only to the upper three voices (Soprano-Alto, Alto-Tenor). The distance between the Bass and Tenor can, and often does, exceed an octave.
Misconception: Any member of a triad can be doubled freely.
- Clarification: There is a distinct hierarchy for doubling. The root is the most common and preferred note to double. The third is doubled least often, and tendency tones like the leading tone should not be doubled.
Misconception: A chord is incorrect if the bass and tenor are more than an octave apart.
- Clarification: This is perfectly acceptable and is a standard feature of SATB writing. A wide interval between the bass and the upper voices provides clarity and strength to the harmonic foundation.
Misconception: "Doubling" means adding an octave above a note in the same part.
- Clarification: In this context, doubling means that two different voices sing or play the same note, either at the unison or, more commonly, at the octave. For example, the Bass plays C2 and the Alto plays C3.
Summary
The principles of SATB voice leading provide a foundational grammar for arranging harmony. By adhering to established conventions of chord spacing, we ensure a balanced and blended texture where individual lines are clear yet connected. The primary rule—keeping the three upper voices within an octave of their neighbors—is key to this clarity. Similarly, the procedures for chord doubling, which prioritize the root and avoid unstable tendency tones, create chords that are stable and harmonically unambiguous. Mastering these two concepts is an essential step in learning to analyze existing music and to compose new music within the common-practice style.