Definition of Chords
Chords in music are simultaneous combinations of three or more notes that create harmony when played together. They form the foundation of tonal music by providing structure and emotional depth, contrasting with single-note melodies. A basic chord, known as a triad, consists of a root note, a third, and a fifth, spaced at specific intervals.
Construction of Chords
Chords are built by stacking intervals above a root note. For example, a major triad uses a major third (four semitones) from the root to the third, followed by a minor third (three semitones) to the fifth, resulting in a bright sound. Minor triads invert this by starting with a minor third, producing a sadder tone. Extended chords add more notes, such as sevenths, to create richer textures.
Practical Example: C Major Chord
Consider the C major chord: it starts with C as the root, adds E (a major third above C), and G (a perfect fifth above C). On a piano, press these keys together for a consonant sound. In a song like 'Let It Be' by The Beatles, this chord progresses to others like A minor and F major, illustrating how chords support the melody and evoke familiarity.
Importance and Applications
Chords are essential for establishing key, tension, and resolution in compositions across genres, from classical symphonies to pop songs. They enable harmonic progressions, such as the common I-IV-V sequence in rock music, which drives emotional narratives. Understanding chords allows musicians to improvise, arrange, and analyze pieces, enhancing creative expression and performance.