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Understanding how chords are constructed is essential for ABRSM theory candidates. It provides the foundation for harmony, voice leading, and musical analysis. This article explores the basics of chord construction, focusing on triads and seventh chords, which are fundamental to Western music theory.
What Is a Chord?
A chord is a group of three or more notes played simultaneously. Chords form the harmonic basis of most Western music. The most common chords are triads, which consist of three notes built on a specific scale degree.
Constructing Triads
Triads are built by stacking thirds on top of a root note. The basic types of triads are major, minor, diminished, and augmented. Each type has a distinct sound and structure.
Major Triad
A major triad consists of a root, a major third, and a perfect fifth. For example, a C major triad includes the notes C, E, G.
Minor Triad
A minor triad has a root, a minor third, and a perfect fifth. For example, A minor triad includes A, C, E.
Diminished and Augmented Triads
A diminished triad contains a root, minor third, and diminished fifth. An example is B, D, F. An augmented triad has a root, major third, and augmented fifth, such as C, E, G#.
Seventh Chords
Seventh chords are built by adding a seventh interval above the root to a triad. They add richness and complexity to harmony and are common in many musical styles.
Major Seventh
A major seventh chord combines a major triad with a major seventh. For example, C major seventh includes C, E, G, B.
Dominant Seventh
This chord consists of a major triad with a minor seventh. An example is G7: G, B, D, F. It is often used to create tension that resolves to the tonic.
Minor Seventh
A minor seventh chord features a minor triad with a minor seventh. For example, A minor seventh includes A, C, E, G.
Summary of Chord Construction
To construct chords effectively, remember these key points:
- Start with the root note.
- Stack thirds to build triads and seventh chords.
- Identify the intervals (major third, minor third, perfect fifth, etc.) to determine chord quality.
- Use chord symbols to denote different types (e.g., C, Cm, C7, Cmaj7).
Practice Tips for ABRSM Candidates
Practice constructing chords on your instrument or with notation. Analyze pieces to identify chord types and progressions. Use flashcards to memorize interval qualities and chord symbols. Regular practice will build confidence and improve your understanding of harmony.