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The concepts of dominant prolongation and dominant preparation are fundamental in music theory, especially in the context of harmonic analysis and composition. Understanding the differences between these two can help musicians and students grasp how harmonic tension and resolution are created and managed within a piece of music.
What Is Dominant Prolongation?
Dominant prolongation refers to the extension of the dominant harmony over a span of musical phrases or sections. It involves delaying the resolution to the tonic, creating a sense of anticipation and tension. This prolongation often occurs through the use of dominant chords and related harmonies that maintain the listener’s expectation of a resolution.
For example, a composer might sustain a V7 chord (dominant seventh) for several measures before resolving to the I chord (tonic). This prolongation heightens the emotional impact and keeps the harmonic tension alive throughout the passage.
What Is Dominant Preparation?
Dominant preparation involves setting up the dominant harmony in a way that leads smoothly to the resolution. It often includes the use of pre-dominant chords or passing harmonies that lead naturally into the dominant, creating a seamless transition. Preparation is about creating a harmonic context that makes the dominant’s arrival more compelling and logical.
For instance, a subdominant (IV) or ii chord might precede the V chord, preparing the ear for the eventual resolution to the tonic. This process enhances the coherence of the harmonic progression and provides a sense of inevitability to the resolution.
Key Differences
- Function: Prolongation extends the dominant, increasing tension, while preparation sets up the dominant to facilitate a smooth resolution.
- Harmonic Content: Prolongation often involves sustained dominant chords, whereas preparation involves pre-dominant chords leading into the dominant.
- Purpose: Prolongation emphasizes tension and anticipation, while preparation emphasizes coherence and smoothness in harmonic progression.
Conclusion
Both dominant prolongation and dominant preparation are essential tools in harmonic storytelling. Prolongation builds emotional tension, while preparation ensures that the harmonic journey feels natural and satisfying. Recognizing these techniques helps musicians craft more compelling and coherent musical narratives.