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Understanding harmonic prolongation is essential for analyzing and appreciating classical piano sonatas. One of the most common types of prolongation is the dominant prolongation, which plays a crucial role in establishing tonality and creating musical tension. This guide will walk you through the steps to recognize dominant prolongation in piano sonatas.
What is Dominant Prolongation?
Dominant prolongation occurs when the dominant chord (V) or its functions are extended over a series of measures without resolving to the tonic (I). This prolongation creates a sense of expectation and tension, which is ultimately resolved when the harmony moves to the tonic.
Step 1: Identify the Key
Before analyzing prolongation, establish the key of the sonata. Look for the key signature, the first and last chords, and recurring tonal centers. Recognizing the tonic helps you identify when the dominant is being prolonged.
Step 2: Find the Dominant Chord
The dominant chord is built on the fifth scale degree. In a major key, it contains the notes G-B-D in C major, or the equivalent in other keys. In minor keys, the dominant may include a raised seventh (leading tone) to create a V7 chord.
Step 3: Look for Prolongation Patterns
Prolongation often appears as a sustained V or V7 chord, or as a sequence of chords that function as a dominant but do not resolve immediately. Listen for:
- Extended dominant harmonies spanning multiple measures
- Harmonic tension without immediate resolution
- Use of passing or neighbor chords that maintain the dominant function
Step 4: Recognize the Tension and Expectation
Dominant prolongation creates a feeling of anticipation. Melodic lines often lead towards the dominant tone, and the harmony may include suspensions or appoggiaturas that delay resolution.
Step 5: Confirm the Resolution
Finally, verify if the prolonged dominant resolves to the tonic. This resolution typically occurs at a phrase boundary or cadential point, providing a satisfying conclusion to the prolongation.
Practice Tips
Practice analyzing different sonatas by listening for prolonged dominant chords. Use a piano or a harmonic analysis tool to identify when the dominant is extended and how it leads to resolution. Over time, recognizing these patterns will become intuitive.