chord
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A chord is a group of three or more musical notes played together at the same time. Chords form the harmonic foundation of music, allowing composers and musicians to create texture, emotion, and structure beyond what single melodies alone can achieve.
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A C major chord. A chord is the simultaneous sound of two or more musical notes. The most common chord has three notes and is known as a triad. Added tone chords, extended chords, and tone clusters can have more than three notes and are common in contemporary classical music and jazz.
An arpeggio is a chord where notes are sounded separately. A series of chords is sometimes called a chord progression. There are several ways to notate chords including figured bass, Roman numerals, the Nashville Number System, and alphabetical chord notation.