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Nonchord tone

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In music theory, a nonchord tone (NCT) is a note that does not belong to the implied chord. These are also called nonharmonic or embellishing tones. While chord tones provide the stable foundation of a piece, nonchord tones add variety and tension. This tension is known as dissonance. Most nonchord tones create specific intervals, such as a second, a fourth, or a seventh. These intervals feel unstable to the listener. This instability creates a musical need for the note to move toward a stable chord tone.

Most nonchord tones follow a predictable three-part pattern to manage this tension. The process begins with a preparation, where a stable chord tone is played. Next comes the dissonance, which occurs when the nonchord tone sounds against the chord. Finally, the process ends with a resolution. During resolution, the dissonant note moves to a stable chord tone. This cycle of tension and release is a fundamental part of musical expression.

Musicians categorize nonchord tones based on how they are emphasized in the rhythm. The most important distinction is whether they are accented or unaccented. Accented nonchord tones occur on strong beats or important parts of a beat. Unaccented nonchord tones occur on weak beats. They can also be classified by their direction of approach and departure. Some move by steps, while others move by larger leaps. This variety allows composers to create many different textures in both homophonic and contrapuntal music.

Unaccented tones include several specific types. An anticipation (ANT) is a note that is approached by step and remains the same. It is essentially a note from the next chord played slightly early. A neighbor tone (NT), or auxiliary note (AUX), moves stepwise away from a chord tone and then returns to that same note. If it moves up, it is an upper neighbor tone. If it moves down, it is a lower neighbor tone. An escape tone (ET), or echappée, is an incomplete neighbor tone. It is approached by step but resolves by skipping in the opposite direction. A passing tone (PT) fills the gap between two chord tones by moving stepwise in one direction.

Accented tones often create more intense emotional effects. A suspension (SUS), sometimes called a syncope, occurs when a note from a previous chord is held over into a new chord. This held note becomes a dissonance against the new harmony. A suspension must resolve downwards by step to a chord tone. If the note is prepared like a suspension but resolves upwards, it is called a retardation. Another accented type is the appoggiatura (APP). This is an incomplete neighbor tone that is approached by a skip and resolved by a step.

History shows that the use of these tones has changed significantly over time. In European classical music, the use of dissonance increased between different musical periods. This was caused by the interaction of linear and vertical musical forces. As a result, complex chords like ninths, elevenths, and thirteenths became normalized. What were once considered nonchord tones eventually became part of the chordal mass itself. Even in jazz, the definition can shift. In 1940s-era bebop, an F played with a C chord might be considered a chord tone if the chord is analyzed as a C7(11).

There are also more complex ways to use nonchord tones. A pedal point (PD) is a note, usually the tonic or dominant, that is held through many chord changes. It is most often found in the lowest voice, which is called a pedal point in organ playing. If it is in an upper voice, it is an inverted pedal. An internal pedal occurs between the upper and lower voices. Additionally, changing tones (CT) consist of two successive nonharmonic tones. Finally, chromatic nonharmonic tones use notes outside the key to create half-step motion. These techniques allow for deep complexity in musical composition.

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