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Non-chord tones (NCTs) are melodic notes that do not belong to the prevailing harmony but create melodic interest, momentum, and smooth connections between chord tones. The main types include passing tones (stepwise motion between two chord tones), neighbor tones (step away and return), suspensions (a held tone that resolves down by step), anticipations (chord tone arrived at early), and appoggiaturas (accented dissonances approached by leap). Each type is characterized by its approach and resolution. Recognizing and correctly labeling NCTs is essential for accurate harmonic analysis and for writing idiomatic melodic lines.
Analyze vocal lines in Bach chorales, distinguishing chord tones from NCTs on each beat and between beats. Begin with passing tones and neighbor tones before tackling suspensions and appoggiaturas. Practice reducing a melody to chord tones only, then re-adding the embellishments to hear their effect.
If you strip away all the ornamentation from a Bach chorale melody, what remains is a series of chord tones — the notes that actually belong to each harmony. But that bare skeleton would sound mechanical and dull. Non-chord tones (NCTs) are the notes between and around the chord tones that give melody its fluency, tension, and character. Understanding them lets you analyze what is "really happening" harmonically in any melodic line, and write melodies that feel alive rather than robotic.
The simplest NCTs are passing tones and neighbor tones. A passing tone fills the stepwise gap between two chord tones moving in one direction — if a chord contains G and B, an A passing tone can connect them smoothly. A neighbor tone steps away from a chord tone and returns: from G up to A and back, or down to F# and back. Both are approached and left by step, making them easy to embed in flowing melodic lines. The difference is purely directional: passing tones travel, neighbor tones orbit.
Suspensions are more dramatic. A suspension occurs when a voice holds a note from the previous chord as the harmony changes beneath it, creating a temporary dissonance that then resolves downward by step. The "4-3 suspension" is the most common: scale degree 4 is held while the chord moves to V, then it resolves down to 3. Suspensions create a sense of yearning and release that is central to expressive tonal melody. Remember: a suspension is always dissonant against the new chord — if it were consonant, it would just be a chord tone.
Other NCT types you will encounter include anticipations (a chord tone that arrives before its chord does) and appoggiaturas (an accented dissonance approached by leap rather than step). Both create tension but are less common in strict four-part writing. As you analyze Bach chorales, start by identifying the chord on each strong beat, then label every note that falls outside that chord — the patterns will quickly become recognizable.
The practical payoff is twofold. For analysis, correctly labeling NCTs prevents you from misidentifying the underlying harmony. (A suspension on beat 1 that resolves on beat 2 is still the same harmony across both beats — you are not hearing a chord change.) For composition, a toolkit of NCT types gives you controllable ways to make melody more expressive without departing from the harmonic logic you have already established.
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