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The study of scales and cadences is fundamental in understanding the development of Western music. Among the various scales used by composers, the harmonic minor and modal scales hold special significance, especially in the context of evaded cadences.
Understanding Evaded Cadences
An evaded cadence occurs when a composer intentionally avoids a traditional cadence, often substituting it with a different harmonic or melodic progression. This technique creates a sense of surprise or prolongs tension, enriching the musical narrative.
The Harmonic Minor Scale
The harmonic minor scale is a variation of the natural minor scale with a raised seventh degree. This alteration introduces a leading tone that strongly resolves to the tonic, making it particularly useful in creating strong cadential points.
In the key of A minor, the harmonic minor scale is: A, B, C, D, E, F, G#, A. The raised seventh (G#) provides a leading tone that enhances the dominant function, often used in evaded cadences to create tension.
Modal Scales and Their Characteristics
Modal scales are based on the modes derived from the major scale, each with unique intervallic structures. They were widely used in medieval and Renaissance music and have seen a resurgence in modern compositions for their distinct colors.
Some common modes include:
- Dorian: Similar to natural minor but with a raised sixth.
- Phrygian: Characterized by a lowered second.
- Lydian: Similar to major but with a raised fourth.
Modal scales can be employed in evaded cadences to introduce ambiguity or a modal flavor, often avoiding traditional dominant-tonic resolutions.
Applying Scales in Evaded Cadences
Composers utilize the harmonic minor scale to craft cadences that sound both compelling and unexpected. For example, substituting a V chord with a chord built on the raised seventh degree can create an evaded cadence that maintains tension without resolving traditionally.
Similarly, modal scales can be used to prolong or delay resolution. For instance, employing the Dorian mode instead of the natural minor can soften the cadence, providing a modal color that diverges from classical expectations.
Examples in Musical Literature
Many classical and modern compositions feature evaded cadences that leverage these scales. For example, Chopin’s minor key works often employ the harmonic minor to create dramatic evaded cadences. In jazz and popular music, modal scales are frequently used to produce a modal interchange effect, enriching harmonic language.
Conclusion
The harmonic minor and modal scales are powerful tools in the composer’s palette for creating evaded cadences. Their unique intervallic structures and tonal colors allow for expressive harmonic progressions that challenge traditional resolutions and enhance musical storytelling.