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The augmented major seventh chord is a fascinating harmony used in various musical styles. It combines unique intervals to create a distinctive sound that adds tension and color to compositions. Understanding its structure and theory can enhance both performance and composition skills.
What Is an Augmented Major Seventh Chord?
An augmented major seventh chord, often notated as Δ+7 or Maj7+, is a four-note chord built from a root, a major third, an augmented fifth, and a major seventh. Its distinctive sound is characterized by the combination of the augmented fifth and the major seventh, which create a tense yet lush harmony.
Construction of the Augmented Major Seventh Chord
The chord is constructed by stacking intervals from the root note:
- Root: The starting note of the chord.
- Major third: Four semitones above the root.
- Augmented fifth: Eight semitones above the root, one semitone higher than a perfect fifth.
- Major seventh: Eleven semitones above the root.
For example, in a C augmented major seventh chord (C Δ+7):
- Root: C
- Major third: E
- Augmented fifth: G#
- Major seventh: B
Sound and Usage
The augmented major seventh chord has a bright yet tense sound, often used to create a sense of unresolved tension or to add color in jazz, classical, and contemporary music. It can serve as a passing chord or a color tone within a progression.
Common Notation and Variations
The chord is typically notated as Maj7+ or Δ+7. Sometimes, especially in jazz, it may be written with a plus sign (+) or the abbreviation Maj7+. The chord can also be voiced differently depending on the musical context, but the core intervals remain the same.
Summary
The augmented major seventh chord is a unique harmonic device that combines a major seventh with an augmented fifth. Its construction involves stacking specific intervals, resulting in a sound that is both bright and tense. Mastering its theory and construction can expand a musician’s harmonic palette and creative possibilities.