Infusing Part-Writing with Musical Judgment: Moving from Rules to Guiding Principles

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In the music theory classroom, we frequently see students who struggle so vehemently to abide by every part-writing maxim that they lose sight of the ultimate goal: creating something that sounds musical and stylistic, thereby coming to a deeper understanding of musical composition.

Rather than teaching tonal part-writing as the amalgamation of large sets of fixed rules, it can be more beneficial to focus upon a relatively small collection of general principles. This tends to foster a more musical environment.

I don’t want to leave the impression that I avoid teaching rules. Nothing could be further from the truth. But when guidelines and generalities (such as most doubling conventions) are presented as gospel, students can begin prioritizing vertical writing over counterpoint, they lose the ability to get themselves out of part-writing jams, and perhaps worst of all, part-writing becomes a rigid and academic task that requires little, if any, musical judgment.

Instead of dwelling on rules, I continually emphasize three fundamental principles:

  • All parts should be easily singable, and each part should have its own identity.
  • Tendency tones (or active tones) should be resolved and should not be doubled.
  • The soprano part should have a nice melody, mostly moving by step; the inner parts should avoid leaping and should preserve common tones when possible.

Chord doubling rules can be broken

One of the most common sets of rules deals with chord doubling. Without question, the majority of the time students would be well advised to double the root of a root position chord. Steven Laitz’s textbook, The Complete Musician: An Integrated Approach to Tonal Theory, Analysis, and Listening, sensibly directs students to “double stable tones. If possible, double the root. ...If it is not possible to double the root, double the fifth. Doubling the third (except in V) is the final option.”

As general guidelines, Laitz’s suggestions seem reasonably sound, but other textbooks present far more prescriptive conventions. They often ask students to memorize lists of what tone should be doubled in every particular triad, regardless of musical context. Such hard and fast rules are, in a certain sense, comforting: They imply there is a formula for doing it right.

Such part-writing strictures demand a set of exceptions. The stack of rules and exceptions can really add up over a semester or two.

A student can easily get buried in rules, and students who memorize and adhere to “the rules” frequently produce grammatically “correct” yet utterly unmusical creations. Where the rules do not work, we tend to provide exceptions. Double the third of a VI chord at a deceptive cadence. Double the third of the ii chord when in minor (or perhaps when it’s in first inversion). The seventh can go up in the progression . The leading tone can go down a third if it’s in the inner voice. The leading tone can go down when moving from V6 to vi in major.

I believe that rules governing chord doubling are overemphasized and can actually damage a student’s understanding of tonal structure. Doubling rules frequently are not context specific, and they emphasize vertical structures over linear patterns.

How students often apply chord doubling rules

To see the sorts of problems that can arise when students have to weigh different sorts of rules, we will look at how the following chord progression might be harmonized. It could easily come from an AP Exam (note that I use the convention of showing the cadential six-four as a dominant chord; some readers will be most familiar with it as ):

Example 1 (below) shows a realization of this harmonic progression by a good (if fictional) student, who is trying to double the root of each triad. The only exception she makes is at the deceptive cadence. As a good student, she knows all too well that one must double the third of the submediant in a deceptive motion to avoid those insidious forbidden parallels. (That is a doubling convention that I wholeheartedly endorse teaching, and one that a lot of students resist learning. How many times have you seen the leading tone unresolved at the deceptive cadence and/or parallel fifths and/or parallel octaves at that location? And if students blow the cadence, they are penalized heavily on the AP Exam, especially in the counterpoint/melodic harmonization exercise.)

Example 1: The progression with root doublings

Our student could well look at the above exercise and see that it might be easier had she started with C in the soprano voice. Such a realization is provided in Example 2. Even here, we have an unattractive leap from Bb to F in the soprano. That one break in melodic smoothness is pretty unmusical, even though no rule has been broken. Likewise, the tenor seems unnecessarily leapy and bizarre. It might get a good grade, but does anyone really want to hear it?

Example 2: The progression with root doublings, starting on C in the soprano

Example 3 features a realization by a (again fictional) student who has been taught to prioritize smooth voice leading, independence of line, and singability. In other words, a minimum number of rules. We can see here that the root is still the most commonly doubled chord member. That’s just the way the deck is stacked in tonal composition. We don’t really need rules to tell us this, although we certainly do need rules to tell us not to double active tones.

Example 3: The progression with a nicer melody, starting on C in the soprano

Example 4 presents another perfectly fine realization of this progression. This time our student (who has not devoted her time to the memorization of doubling strictures) begins with the third on top. This attempt doubles the chordal fifth a couple of times, which many teachers forbid, but the result is something that would put a smile on any AP Exam Reader’s face.

Example 4: The progression with a nice melody, starting on A in the soprano

Perhaps the best melody for this progression utilizes one of the most common melodic formulas associated with the progression the melodic pattern of scale degrees 3-4-5 (mi-fa-sol). If a student saw and recognized that musical pattern, she might well have decided to begin the melody on tonic, moving up the scale by step. If that student was concerned with doubling conventions, however, she might well produce the realization found in Example 5, which starts well, but ends badly with an unmusical melodic leap (written to avoid doubling the third of a chord) and tough-to-avoid parallel fifths in the inner voice.

Example 5: Nice melody to start, but then trouble ensues

To avoid that ugly soprano leap in measure 2, a student would be better off writing a stepwise descent from C. This necessitates doubling the third of the ii6 chord (frequently a good idea in any case), and a preference for smooth inner voices might also lead to doubling the third in the I6 chord. See Example 6 for this rendition, which to me seems the best of the bunch.

Example 6: Nice melody to start, and then good melodic closure


Focus on these principles:

  • All parts should be easily singable, and each part should have its own identity.
  • Tendency tones (or active tones) should be resolved and should not be doubled.
  • The soprano part should have a nice melody, mostly moving by step; the inner parts should avoid leaping and should preserve common tones when possible.

With these principles firmly in place, students require far less guidance and are able to move through material more quickly and with greater confidence.

Authored by

Michael Buchler
Florida State University
Tallahassee, Florida