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12-2  VOICE LEADING OF TRIADS WITH ROOT MOVEMENT BY FIFTH

5. Root Movement by Fifth.

Root movement by the interval of a fifth presents unique problems in voice leading. Care must be taken to avoid problems of hidden or parallel fifths and/or octaves when the root moves by the interval of a fifth. Change of position is one method that can help avoid these voice leading problems.

6. Voice Leading Triads With Root Movement By Fifth.

a. To change position between chords whose roots are a fifth apart, move the bass voice up or down the interval of a fourth or a fifth (Figure 12-9).

Figure 12-9. Bass Voice Movement

b. Next, move the third of the first triad (up or down the interval of a fourth) to the third of the second triad (Figure 12-10).

Figure 12-10. Movement of Third of Triad

c. Keep the common tone (Figure 12-11).

Figure 12-11. Keep Common Tone

d. Then move the remaining upper voice by step (Figure 12-12). Notice the change of position that has occurred between each chord in each measure.

Figure 12-12. Move Remaining Upper Voice By Step

e. When using change of position to voice lead triads whose root movement is by fifth, care must be used to avoid overlapping voices. Overlapping voices occur when two adjacent voices move in similar motion and the lower voice ascends to a pitch above that just left by the upper voice (or when the upper voice descends to a pitch below that just left by the lower voice). The first measure of Figure 12-13 shows overlapping voices. The second measure of Figure 12-13 shows how a change of position has corrected the overlapping voices.

Figure 12-13. Avoided Overlapping Voices

NOTE: Root movement of the second and third were taught in previous lessons and will not be covered in this lesson.

David L. Heiserman, Editor

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Revised: June 06, 2015