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Nonharmonic Tones
Within the context of tonal music, any pitch that is not heard as a member of the prevailing harmony (chord) is considered a nonharmonic (nonchord) tone.

The common nonharmonic tones are usually identified as belonging to one of eight categories.  Each is labeled based on two criteria:
     How it is approached (the pitch that precedes it)
     How it is resolved (the pitch that follows it)
 
Following is a table that indicates this criteria for each type of nonharmonic tone.


Note:  A Neighbor Group is a variation of a simple Neighbor Tone.  The NG is a lower neighbor (below the chord tone) and an upper neighbor (above the chord tone) in combination.  The order of the upper and lower neighbors can vary.
 
Examples











Passing Tone
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Neighboring Tone
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Neighbor Group
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Appoggiatura
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Escape Tone
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Anticipation
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Suspension
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Retardation
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Pedal Point