In AP Music Theory, a nonharmonic tone (also called a nonchord tone or embellishing tone) is a melodic note that doesn't belong to the chord sounding underneath it, such as a passing tone, neighbor tone, or suspension, and it must resolve back into the harmony by step.
A nonharmonic tone is any note in a melody or voice part that isn't a member of the chord being played at that moment. If the harmony is a C major triad (C-E-G) and the soprano sings a D, that D is nonharmonic. It's decoration, not structure. The big three you'll see constantly are the passing tone (steps between two chord tones), the neighbor tone (steps away from a chord tone and comes right back), and the suspension (a chord tone held over from the previous chord that has become dissonant and must resolve down by step).
The golden rule is that nonharmonic tones are dissonances with a plan. Each type is defined by how it's approached and how it leaves. That's why analysis questions ask you to label them precisely instead of just circling "wrong notes." When you write Roman numerals under a melody, you have to mentally filter out the nonharmonic tones first, because the chord is built from what's left. A melody full of passing tones can make a plain I-IV-V-I progression look way more complicated than it is.
Nonharmonic tones live in Unit 5: Harmony and Voice Leading II, and they show up directly in Topic 5.5: Cadences and Predominant Function (learning objective AP Music Theory 5.5.A, identifying cadence types in performed and notated music). Here's the connection that trips people up: cadences are defined by their chords, but the music you hear at a cadence is often dressed up with embellishments. The classic example is the 4-3 suspension over the V chord at an authentic cadence. If you hear that dissonance and think the harmony changed, you'll mislabel the cadence. Recognizing nonharmonic tones lets you hear through the decoration to the actual progression underneath, which is exactly the skill 5.5.A is testing. The same filtering skill powers harmonic dictation, melodic analysis, and the written FRQs.
Keep studying AP® Music Theory Unit 5
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view galleryCadences and Predominant Function (Unit 5)
Cadences are where composers love to plant suspensions, especially the 4-3 over V. To identify a cadence correctly per 5.5.A, you have to recognize that the suspended note is nonharmonic and the chord is still plain V resolving to I.
Leading Tone (Units 1, 4-5)
The leading tone is the opposite case worth keeping straight. It's a chord tone (the third of V) that still has a strong pull to resolve up to tonic. Both nonharmonic tones and the leading tone are 'tendency' notes, but the leading tone belongs to its chord while a nonharmonic tone doesn't.
Phrygian Half Cadence (Unit 5)
In a Phrygian half cadence (iv⁶-V in minor), every note matters because the cadence is defined by specific chord members in the bass. Spotting which melodic notes are embellishments versus real chord tones keeps you from mistaking it for some other predominant-to-dominant move.
Contrary Motion (Units 4-5)
Nonharmonic tones are a voice-leading tool, and contrary motion is the texture they live in. Passing tones often fill in one voice while another moves the opposite direction, smoothing lines without creating parallel fifths or octaves.
Nonharmonic tones get tested in two directions. In analysis and aural MCQs, you identify and name them (passing tone, neighbor tone, suspension) or see through them to label the underlying chords and cadence. In the written FRQs, you produce or account for them. On the figured bass realization FRQ (Question 5 on the 2023 and 2024 exams), figures like 4-3 over the bass literally notate a suspension, and you have to realize it with correct preparation and downward resolution. On the composition FRQ (Question 7, 2023 and 2024), you write a bass line under a given melody and supply Roman and Arabic numerals, which means deciding which melody notes are chord tones and which are nonharmonic before you commit to a harmony. Treat a passing tone as a chord tone and your whole Roman numeral analysis goes sideways.
Nonharmonic doesn't mean chromatic. A nonharmonic tone is judged against the current chord, not the key. In C major over a C chord, the note D is completely diatonic but still nonharmonic. Flip it around and a chromatic note can be a chord tone, like F♯ as the third of a V/V chord. Always ask 'is this note in the chord?' not 'is this note in the key?'
A nonharmonic tone is a melodic note that doesn't belong to the chord sounding beneath it, even if it's perfectly in the key.
Each type (passing tone, neighbor tone, suspension) is defined by how it's approached and how it resolves, almost always by step.
When writing Roman numerals under a melody, filter out the nonharmonic tones first and build the chord from the notes that remain.
Suspensions like the 4-3 over V are the most common nonharmonic tones at cadences, and they don't change the cadence type.
On the figured bass and composition FRQs, mishandling a suspension's preparation and resolution costs points on eighteenth-century voice-leading procedure.
It's a melodic note that isn't a member of the chord sounding at that moment, like a passing tone, neighbor tone, or suspension. These tones add motion and dissonance but resolve by step back into the harmony.
Yes. Nonharmonic tone, nonchord tone, and embellishing tone all mean the same thing on the AP exam. Don't let the different labels throw you in question stems.
No, they're not wrong at all. They're intentional dissonances that follow strict rules of approach and resolution, and eighteenth-century style depends on them. Some, like consonant neighbor tones, barely sound dissonant.
Nonharmonic is measured against the chord, chromatic is measured against the key. A diatonic note like scale degree 2 over a tonic triad is nonharmonic but not chromatic, while F♯ in a V/V chord in C major is chromatic but is a chord tone.
A passing tone steps between two different chord tones, like C-D-E, so it travels somewhere new. A neighbor tone steps away from a chord tone and returns to the same note, like C-D-C. Both move by step; the difference is where they end up.
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