tetrachord

A musician plays a tetrachord on the piano.

Definition

1. Noun:
   • A series of four notes: In music theory, "tetrachord" refers to a set of four consecutive pitches, typically spanning the interval of a perfect fourth (five semitones). It is a fundamental building block of scales and modes in Western music.

Usage Examples

• Noun:
  • The ancient Greek tetrachord formed the basis of their musical system. (A series of four notes used in Greek music theory.)
  • In a major scale, the first four notes (C, D, E, F) constitute a tetrachord. (A group of four pitches within a scale.)

Advanced Usage

• "Diatonic tetrachord": a tetrachord consisting of two whole steps and one half step (e.g., C–D–E–F).

  • The diatonic tetrachord is essential for constructing major scales. (A specific pattern of intervals in a four-note set.)

• "Chromatic tetrachord": a tetrachord where all four notes are separated by half steps (e.g., C–C#–D–D#).

  • The chromatic tetrachord creates a dense, dissonant sound. (A series of semitones within a fourth.)

Variants and Related Words

• Tetrachordal (adj): relating to or consisting of a tetrachord.

  • The tetrachordal structure of the melody is clear. (The melody is built on a four-note pattern.)

• Tetrachordic (adj): another form of the adjective, meaning pertaining to tetrachords.

  • Tetrachordic scales are common in ancient music. (Scales based on tetrachords.)

Synonyms

• Four-note set: a general term for any collection of four pitches.
• Quadrichord: a less common synonym for tetrachord.

Related Idioms

• No direct idioms — "tetrachord" is a technical term with no common idiomatic usage in everyday language.