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In classical music, harmony plays a crucial role in creating tension and resolution. One of the key tools composers use to achieve this is the secondary dominant. Understanding how secondary dominants function can deepen our appreciation of musical structure and expressiveness.
What Are Secondary Dominants?
Secondary dominants are chords that temporarily emphasize a harmony other than the tonic by functioning as the dominant of a specific chord within the key. They are essentially “dominant” chords that lead to a target chord other than the tonic, creating a sense of tension before resolution.
How Do Secondary Dominants Work?
In a typical major or minor key, the dominant chord is built on the fifth scale degree (V). Secondary dominants are built on the fifth degree of a different chord, often indicated with a Roman numeral and a slash. For example, V/ii is the dominant of the minor second (ii) chord.
For instance, in the key of C major, the ii chord is D minor. The V of ii (V/ii) is A major or A7, which functions as a dominant leading to D minor. When played before D minor, A7 creates a strong pull, making the progression more dynamic and expressive.
Common Secondary Dominants
- V/ii: Dominant of the ii chord
- V/iii: Dominant of the iii chord
- V/IV: Dominant of the IV chord
- V/V: Dominant of the V chord
- V/vi: Dominant of the vi chord
Function and Effect in Progressions
Secondary dominants add color and tension to harmonic progressions. They create a sense of movement by temporarily tonicizing a chord other than the tonic. This technique enriches the music and guides the listener through different harmonic landscapes.
For example, a progression like C – A7 – D minor – G7 – C uses secondary dominants (A7 leading to D minor, G7 leading back to C) to build anticipation and make the resolution more satisfying.
Conclusion
Secondary dominants are powerful tools in classical harmony that help composers craft more engaging and expressive progressions. By understanding their function, students and teachers can better analyze music and appreciate the intricacies of harmonic language.