Chord
A segment whose endpoints are on the circle
In music theory, a chord is a set of three or more musical notes played together in a harmonious fashion. It is essentially a group of pitches that sound pleasant when played simultaneously. Chords are the building blocks of harmony and are used in virtually every style of music imaginable. In Western music, the most common type of chord is the triad, which consists of a root note, a third, and a fifth. The root note is the lowest note in the chord and serves as its foundational tone. The third is either a minor or major interval distance above the root note, and the fifth is a perfect fifth interval distance above the root note. The type of third determines whether the chord is major or minor, and the addition of other notes determines its quality, such as a seventh chord or a ninth chord. Chords also function in a harmonic context, typically in progressions, and serve as the foundation for melodies and other musical ideas.
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