Dominant and subdominant keys

Definition

Dominant and subdominant keys refer to the fifth and fourth scale degrees of a key, respectively, with the dominant being the fifth (V) and the subdominant being the fourth (IV). These keys play a vital role in establishing tonality and tension within music, particularly when using tonicization through secondary dominant chords. They help create a sense of movement and resolution in a progression, leading back to the tonic or home key.

5 Must Know Facts For Your Next Test

1. In a major key, the dominant key is built on the fifth scale degree and typically includes the notes from that scale, creating a strong pull back to the tonic.
2. The subdominant key, based on the fourth scale degree, serves as a point of departure that can lead to modulation or transition into other keys.
3. Secondary dominant chords can be applied to both dominant and subdominant keys, temporarily shifting the tonal focus and heightening harmonic interest.
4. The progression from subdominant to dominant creates a strong sense of tension that resolves back to the tonic, enhancing musical expression.
5. Understanding dominant and subdominant keys is essential for analyzing and composing music that effectively uses tension and resolution.

Review Questions

• How do dominant and subdominant keys contribute to the overall tension and resolution in a musical piece?
  • Dominant and subdominant keys create tension by establishing harmonic relationships that lead back to the tonic. The dominant key, being the fifth scale degree, has a strong gravitational pull toward the tonic. The subdominant key adds further complexity by offering a point of departure that can transition into various harmonic progressions. Together, they work to build anticipation for resolution, making them crucial for effective musical storytelling.
• Discuss how secondary dominants can be used in conjunction with dominant and subdominant keys to enhance harmonic progressions.
  • Secondary dominants provide an opportunity to temporarily tonicize chords within the context of dominant and subdominant keys. By introducing these secondary chords, composers can create moments of heightened tension before resolving back to the primary harmony. This technique adds depth to harmonic progressions, allowing for richer textures and more engaging transitions within a piece.
• Evaluate how an understanding of dominant and subdominant keys can influence one's approach to composition and arrangement in tonal music.
  • A solid grasp of dominant and subdominant keys allows composers and arrangers to effectively manipulate tension and resolution in their works. By knowing how these keys function within functional harmony, one can craft progressions that evoke specific emotions or highlight musical themes. This understanding enables more sophisticated compositional choices, leading to works that resonate deeply with listeners through their harmonic structure.

Related terms

Tonic:

The tonic is the first scale degree of a key, serving as the home base and point of resolution in tonal music.

Secondary Dominant: A secondary dominant is a chord that functions as the dominant of a diatonic chord other than the tonic, used to tonicize that chord temporarily.

Functional Harmony: Functional harmony refers to the relationship and roles of chords within a tonal framework, where chords have specific functions like tonic, dominant, or subdominant.