We can view the voicing rules (i.e. spacing, range, doubling, and voice-crossing) as our guidelines for creating the vertical aspect of this style of music, and our voice-leading rules (i.e. tendency tones, conjunct lines, and avoiding part-writing errors) as guidelines for creating the horizontal aspect of this style of music. By combining these ideas with a general knowledge of diatonic chord progressions, we can begin composing our first attempts at chorale-style music.
Before beginning, please remember that when composing in this style, you occasionally will need to bend, or even break, these rules to accommodate other musical goals. There is not a “right” or “wrong” hierarchy for the conventional rules of part-writing. For example, you might choose to accept parallel perfect 5ths if you are trying to create a particular melodic line that emphasizes stepwise motion. Or, you might decide to use voice-crossing of the inner voices to change the timbre and texture of a passage. So even the cleverest of composers may choose to eschew convention if it does not align with their musical goals, but for our beginning attempts, you should do your best to observe every rule in order to understand their importance and implementation.
In Unit 10a, we outlined a method for harmonizing a melody:
And if we employ the the stylistic guidelines that we studied in Unit 10 for this style, we can improve our part-writing by:
Remember that circle-of-fifths progressions work because the voice-leading taps into the primary functions of diatonic harmony. If you review Unit 7a, you will remember that we created the harmonic flow chart by simply following good voice-leading between chords that have roots separated by a descending P5/ascending P4. Admittedly, long strings of root-position chords create unmelodic bass lines, but they still represent the strongest voicing for many sonorities.
To give you a chance to create all four voices, we will now compose a four-part chorale using a circle-of-fifths progression. Because you now have harmonies and a bass line composed for you, you can use the same process as above but replace steps 3 and 4 (and 5 if given a pre-determined bass line from the harmony):
Try to create a clean and simple texture. Write the soprano line from the given first pitch, and then fill in the inner voices following the guidelines above.
After you have completed your harmonization, make sure to double-check it for part-writing errors. If you feel good about your attempt, try changing your melody and trying again.
After attempting this for the first time, most students are surprised at how relatively simple this process is once you get started. Your first harmonization from above was probably similar to this:
Because the chord progression provides a vertical framework and the focus on smooth voice-leading provides a horizontal framework, most of the process is simply following a pattern. This example is admittedly straightforward, because it relies entirely on root-position triads in a circle-of-fifths progression.
In studying music theory, we will often spend more time discussing the exceptions to rules than the actual rule itself. And even though the general rule for resolving chordal sevenths–Chordal sevenths resolve down by step–is fairly consistent, there are common situtations in which you will be forced to break this rule (e.g. pre-determined melodies, sequences, etc.) Make downward stepwise resolution your default until you are forced to choose otherwise.
Try adding the following two seventh chords to our circle-of-fifths progression, making sure to pay attention to how your chordal thirds and sevenths are resolving.
These slight alterations create more issues in dealing with the resolutions of tendency tones. The first arises between the second and third chords. If you simply choose the smoothest voice-leading possible for each voice going into the second chord, vi7, you will place the chordal seventh in the tenor voice. This locks the voice-leading of the tenor voice into resolving downward by step to the third of the following ii chord, and in turn, that chordal third has its own tendencies and should resolve upward by step to the the root of the next chord. This means that the initial placement on the vi7 effectively locks the entire tenor voice into place. From there, our alto voice is predetermined, because we do not want to double the third of the ii chord, leaving us with only the closest D or A. If we were to move to the A, that would create parallel perfect 5ths with the bass voice, so we can only choose the D for the alto voice. To move to the next chord, if we do not alter our soprano voice, we are then forced to place a B in the tenor voice which creates a less melodic tenor line.
While this works, it leaves many strange voicings, such as the tripled roots of the ii and I chords as well as the unmelodic tenor line. There is a simpler option. It is easier to have the alto voice jump slightly to the the chordal seventh on the vi7 which leads to the following progression.
Notice that the chordal third in the alto voice of the ii chord defies its tendency to resolve upwards to the root, and instead, uses static motion to become the chordal seventh of the V7. This is our first example of having to make a choice between two guidelines; is it better to prioritize smooth part writing or tendency tone resolution. In this case, the smooth voice-leading creates a stronger overall texture, so I prefer that option. You could, however, prefer the other sound and prioritize your tendency tones.
Of course, there are multiple chords in our circle-of-fifths progressions that have root movement by intervals other than 4ths and 5ths. Try harmonizing the following short chord progressions while observing our guidelines. Keep track of what types of root movement create the most issues while developing at least two possibilities for each of the progressions.
When you were harmonizing these short progressions, which chord progression presented the most issues? For most, it will likely be when the progressions that have root-movement by 2nd, particularly a progression like IV-V-vi. Let’s start by isolating a common example of this movement, V moving to vi. In this progression, the V is acting according to its standard dominant function, but the vi chord has replaced the I chord in the position where a tonic function should occur. This progression represents a functional substitution in which vi is now acting as the tonic function. (This concept has application within the dominant and pre-dominant functions as well, but we need to explore first-inversion chords in the next topic, 11b, before we are ready for that discussion):**
A functional substitution can, and often should, inform your voice-leading. When a root-position V chord precedes a root-position vi chord, we must choose to prioritize either our doubling conventions or our part-writing conventions. More specifically, do we want to double the third or do we want to end up with parallel perfect 8ves/5ths? We can demonstrate this by looking at two nearly identical progressions. Harmonize the following two progressions; first with the standard tonic function (i.e. V to I) and then with the functional substitution (i.e. V to vi.) Even though the I chord and vi chord have two common tones–the first and third scale degrees–you will have to make very different choices to avoid voice leading errors.
When attempting this deceptive cadence, you hopefully realized that you cannot allow the tenor voice to remain on G and then resolve to A because it creates parallel octaves with the bass voice. Because the vi chord acts as a replacement for a I chord when it is part of a deceptive cadence, we double the scale degree that works best for a I chord, do, rather than the standard doubling of the root, la or fifth, mi. In this progression, it is correct to break standard convention for doubling and double the chordal third of the vi chord. This doubling should now be your permanent convention for deceptive cadences.
So for the above example, a better approach would be to alter the melody to allow for a doubling of the chordal third of the vi chord.
The other difficult resolution in the previous example was when the root position IV chord moved to the V chord. We do not have a functional substitution to provide a doubling exception here, so instead you must be careful about how you resolve the voices. Harmonize the following progression without altering the given pitches, and pay particular attention to the direction that the upper voices resolve as you avoid part-writing errors.
There are some commonly used exceptions to our general part-writing conventions. For example, when a chord progression has a root that moves down by P5, we expect the chordal third to resolve up by step to the root of the following chord. However, if you need to change the texture of your part-writing to be more or less compact, you may choose to have the chordal third leap to the following chordal third which changes the entire voicing possibilities of the two chords. (Note that you can only use this on the leading tone if it is in an inner voice.) Use this method to fill in the inner voices in the following example to change the voicing of the final chord.
Another common exception is called the frustrated leading tone. While not considered ideal, you can choose to have the leading tone resolve by skipping downward to the root of the tonic chord, if the leading-tone is in an inner voice. This can solve doubling issues if you are trying to fix an incomplete triad by adding the chordal fifth. Try it in the tenor voice on the following two progressions. Notice that this allows you to create a deceptive cadence without having to double the chordal third of the vi chord.
When first asked to compose a simple chorale, it is easy to feel paralyzed as you consider all of the rules and guidelines that you have learned. Luckily, if you develop an order to process the guidelines, they greatly simplify the part-writing process. It is much simpler to write a melody when you only have one or two options for the next pitch!
As stated above, you should use smooth voice-leading when possible–making it a high priority in your decision-making process–but what constitutes “smooth” voice-leading? The simple answer is that stepwise, or sometimes static, motion is preferred, although this is only one decision point to consider. When you are creating a line, you will need to balance stepwise motion against avoiding errors. For our simple chorale-style, we are not using non-chord tones yet, so your next pitch must be a chord-tone. This means that you must also consider the notes that are already present such as the bass line or melody in order to ensure that you form a complete harmony and avoid errors. When you add in doubling and range limitations, you can usually narrow your options to one pitch.
You should also understand that while there are some general guidelines for resolving tendency tones, there are no simple rules that are unbreakable. At its most basic, ti resolves up by step, and fa resolves down by step. When part-writing, however, this is too simplistic a view. For example, fa often moves upward by step to sol, either as part of an ascending scalar melodic line or in the bass line when a pre-dominant chord (i.e. IV or ii6 moves to a root-position V chord. A more advanced part-writer may think that ti and fa are tendency tones when they are part of a V7 chord, so therefore, the rule for tendency tones should be that chordal thirds resolve up by step and chordal sevenths resolve down by step. This is a better rule, but it also falls apart when we leave circle-of-fifths progressions (chords with roots separated by a descending P5). When a IV chord moves to a V chord, it is impossible for the third to move up by step to the root of the V chord. For now, the easiest rule for tendency tones is:
As a review, here are our finalized methods for part-writing in a four-part chorale style:
I next asked them to add two seventh chords along with the rule that the chordal seventh should resolve down by step.