🎶ap music theory review

Locrian

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

Locrian is the seventh mode of the diatonic scale, characterized by its unique interval structure which includes a diminished fifth. It is often described as unstable or dissonant, making it less common in Western music. The mode is built on the seventh degree of the major scale, and its distinctive sound influences various musical styles, particularly in jazz and experimental genres.

5 Must Know Facts For Your Next Test

  1. The Locrian mode is built from the seventh degree of the major scale, meaning its notes are derived from the major scale starting on this note.
  2. It features a unique interval pattern of half, whole, whole, half, whole, whole, whole steps.
  3. The diminished fifth interval between the root note and the fifth scale degree creates a distinctive tension that is characteristic of the Locrian mode.
  4. Due to its dissonant qualities, Locrian is rarely used as a tonal center in compositions compared to other modes.
  5. In jazz music, the Locrian mode is often used over half-diminished chords, providing a rich harmonic texture.

Review Questions

  • How does the interval structure of the Locrian mode contribute to its unique sound compared to other modes?
    • The Locrian mode's interval structure includes a diminished fifth between the root and fifth degrees, which creates a sense of instability and dissonance. This dissonance sets it apart from other modes like Ionian or Aeolian, which have more stable sounds. The pattern of half and whole steps further contributes to its distinct character, making it less common as a tonal center in music.
  • Discuss how the Locrian mode is utilized in jazz music and what effect it has on harmony.
    • In jazz music, the Locrian mode is often applied over half-diminished chords, which enhances its characteristic tension. This mode provides a complex harmonic palette that allows for innovative improvisation and rich textures. Jazz musicians utilize the inherent dissonance of the Locrian mode to explore unconventional sounds and push musical boundaries.
  • Evaluate the role of the Locrian mode in contemporary music and its impact on genre development.
    • The Locrian mode plays a significant role in contemporary music by influencing various genres such as jazz, metal, and experimental music. Its unique dissonance allows composers and performers to experiment with tension and release in their works. As artists continue to explore unconventional tonalities, the Locrian mode has inspired new approaches to composition and improvisation, leading to innovative sounds that challenge traditional musical frameworks.

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