Table of Contents
Modern harmony has expanded the traditional boundaries of tonal music, incorporating techniques like modal interchange and borrowed chords to create richer, more expressive progressions. Central to these techniques is the resolution of the leading tone, which provides a sense of tension and release that enhances musical interest.
The Role of Leading Tone in Tonal Music
The leading tone is the seventh scale degree in a diatonic scale, typically a half step below the tonic. Its primary function is to create a strong pull towards the tonic, establishing a sense of resolution. In traditional harmony, the leading tone is often emphasized through voice-leading and melodic movement, guiding the listener’s ear naturally back to the home key.
Modal Interchange and Borrowed Chords
Modal interchange involves borrowing chords from parallel modes or keys to add color and variety. For example, a piece in major might borrow a chord from the parallel minor, such as the iv chord, to evoke a different emotional quality. These borrowed chords often introduce altered or non-diatonic tones, including the leading tone, which may require special attention to resolution.
Leading Tone Resolution in Modal Interchange
When a borrowed chord contains a leading tone that does not belong to the original key, composers often resolve it in a way that maintains harmonic coherence. For example, in a borrowed iv chord from the minor mode, the leading tone (raised seventh) might be resolved downward to the sixth or directly to the tonic, depending on the context. This resolution preserves the sense of tension and release characteristic of traditional harmony.
Examples of Leading Tone Resolution with Borrowed Chords
- Example 1: In a major key, borrowing a bVII chord from the Mixolydian mode introduces a lowered seventh. Resolving the leading tone from the bVII back to the tonic creates a strong pull, emphasizing the modal interchange.
- Example 2: A borrowed iv chord from the minor key contains a raised leading tone. Resolving this tone downward to the sixth or directly to the tonic maintains the harmonic tension and adds emotional depth.
Practical Applications and Compositional Techniques
Composers and songwriters use leading tone resolution in borrowed chords to create smooth voice leading and emotional impact. Techniques include:
- Resolving the leading tone downward to the tonic or sixth degree for a sense of closure.
- Using chromaticism to emphasize the leading tone before resolution.
- Employing modal interchange to add unexpected color while maintaining harmonic coherence through proper leading tone resolution.
Conclusion
The resolution of the leading tone remains a fundamental aspect of harmonic practice, even within modern approaches like modal interchange and borrowed chords. Mastery of this technique allows composers to craft progressions that are both emotionally compelling and harmonically rich, bridging traditional and contemporary musical language.