AP Music Theory Unit 2 Notes: Minor Tonality and Melodic Thinking

Minor Scales (Natural, Harmonic, Melodic)

What “minor” means (and why there are multiple minor scales)

A scale is an ordered collection of pitches that a piece (or a passage) tends to use, usually centered around a tonic (the “home” pitch). In minor, the most important sound difference from major is the quality of the tonic triad: minor keys typically feature a minor third above the tonic (for example, A–C instead of A–C#). That single change affects how melodies and harmonies behave.

Unlike major, minor comes in three common forms—natural minor, harmonic minor, and melodic minor—because composers and performers historically adjusted certain scale degrees to solve musical problems:

  • Problem 1: weak pull to tonic. In natural minor, scale degree 7 is a whole step below the tonic (for example, G in A minor), which creates less “magnetic” pull back to tonic than major’s half-step leading tone.
  • Problem 2: awkward melodic gap. If you raise scale degree 7 to create a stronger pull (harmonic minor), you create a large interval between scale degrees 6 and 7 that can sound angular in melody.

So the three forms of minor are best understood not as three unrelated scales, but as three versions of the same key used for different melodic/harmonic goals.

Natural minor: the basic pitch collection

Natural minor is the “default” minor scale. You can think of it in two reliable ways:

  1. As a pattern of whole steps and half steps.
  2. As a major scale with altered scale degrees.

Compared to a major scale on the same tonic, natural minor has:

  • lowered 3, lowered 6, and lowered 7.

Example (A major vs. A natural minor):

  • A major: A B C# D E F# G# A
  • A natural minor: A B C D E F G A

Why this matters: natural minor is the pitch collection you’ll often see in melodies, especially when the music isn’t strongly pushing toward cadences. But for strong cadences and dominant-function harmony, composers often modify it.

Harmonic minor: creating a leading tone for harmony

Harmonic minor is natural minor with a raised scale degree 7. That raised 7 is called a leading tone because it sits a half step below tonic and strongly wants to resolve up.

Example (A harmonic minor):

  • A B C D E F G# A

Why this matters harmonically:

  • In minor, the dominant chord built on scale degree 5 is naturally minor (E–G–B in A natural minor). Raising scale degree 7 (G#) turns the dominant into a major triad (E–G#–B) and enables a stronger V–i authentic cadence.

What can go wrong melodically:

  • Raising 7 creates a bigger gap between scale degrees 6 and 7 (in A: F to G#). That interval is an augmented second, which can sound exotic or “leapy” in common-practice style melodies. It isn’t “illegal,” but it’s often avoided in singable melodic writing.

Melodic minor: smoothing melody (especially ascending)

Melodic minor is a melodic solution: when ascending, you raise scale degrees 6 and 7 to avoid the augmented second and create smoother stepwise motion into the tonic.

  • Ascending melodic minor: natural minor with raised 6 and raised 7.
  • Descending melodic minor: typically reverts to natural minor (lowered 6 and 7).

Example (A melodic minor):

  • Ascending: A B C D E F# G# A
  • Descending: A G F E D C B A

Why this matters:

  • In melodic lines that travel upward toward a cadence or climax, raised 6 and 7 support smooth stepwise motion and strong tonal direction.
  • Descending lines often don’t need a leading tone “pull,” so they commonly use the natural minor form.

A key misconception to avoid: melodic minor is not “the minor scale.” It’s one common behavior pattern in melodic writing. Real music mixes forms constantly—within a single phrase you might see natural-minor notes in one measure and harmonic-minor notes at a cadence.

How to build any minor scale (a practical step-by-step method)

When you’re asked to write a minor scale on an exam, reliability matters. Here’s a method that prevents common errors:

  1. Start with the tonic letter name and write the natural-note skeleton upward (keeping letter names in order). Example: A B C D E F G A.
  2. Decide which form you need (natural, harmonic, melodic).
  3. Apply accidentals to scale degrees 6 and/or 7 as needed:
    • Natural minor: lower 3, 6, 7 relative to major.
    • Harmonic minor: raise 7 relative to natural minor.
    • Melodic minor (ascending): raise 6 and 7 relative to natural minor.

Worked example: build E minor in all three forms.

  • First, E natural minor uses the key signature of its relative major (G major: one sharp), so the pitch collection is:
    • E F# G A B C D E
  • E harmonic minor raises scale degree 7 (D to D#):
    • E F# G A B C D# E
  • E melodic minor ascending raises scale degrees 6 and 7 (C to C#, D to D#):
    • E F# G A B C# D# E
    • Descending typically returns to natural minor.

Solfege in minor (how AP Music Theory often treats it)

In AP Music Theory, you’ll frequently use movable-do solfege. For minor, many classrooms use la-based minor (relative minor):

  • In C major, do = C. The relative minor is A minor, and A becomes la.

So A natural minor might be sung: la ti do re mi fa sol la.

However, some teachers use do-based minor (tonic is do in both major and minor). Because both systems exist, the safest approach is:

  • Know which system your course expects.
  • If asked to label scale degrees, you can always fall back on scale-degree numbers (1 through 7) to avoid solfege confusion.
Exam Focus
  • Typical question patterns:
    • “Write the [natural/harmonic/melodic] minor scale starting on ___ (with correct accidentals).”
    • “Identify the form of minor used in this excerpt (natural vs. harmonic vs. melodic) based on raised 6/7.”
    • “Explain why scale degree 7 is raised at a cadence in minor (leading tone and dominant function).”
  • Common mistakes:
    • Mixing up which degrees change: harmonic minor raises 7 only, melodic minor (ascending) raises 6 and 7.
    • Forgetting that melodic minor usually descends as natural minor in common-practice contexts.
    • Writing incorrect letter names (for example, using the right pitch class but the wrong spelling). Spellings matter in theory.

Minor Key Signatures

What a key signature tells you (and what it doesn’t)

A key signature is a set of sharps or flats placed at the beginning of the staff that tells you which notes are altered “by default” throughout the piece (unless canceled by accidentals). Key signatures are a notational shortcut, not a full description of the scale form.

This matters especially in minor because:

  • Minor key signatures correspond to natural minor (and to the relative major), not to harmonic or melodic minor alterations.
  • Raised 6 and/or 7 in harmonic/melodic minor are usually shown with accidentals in the music, not added to the key signature.

So if you see a minor-key melody using a key signature, you should expect occasional accidentals (especially leading tones) when the harmony or melody needs them.

Relative major and relative minor (the key relationship you must master)

Every major key has a relative minor that shares the same key signature (same sharps/flats). The relative minor’s tonic is a minor third below the major tonic (or, equivalently, the 6th scale degree of the major scale).

Examples:

  • C major (no sharps/flats) ↔ A minor (no sharps/flats)
  • E♭ major (3 flats) ↔ C minor (3 flats)
  • G major (1 sharp) ↔ E minor (1 sharp)

Why this matters on the exam: you are often given a key signature and asked to identify the key. In minor, the key signature alone gives you two possibilities—one major, one minor—so you need additional context.

How to find the minor key from a key signature (practical methods)

When you’re given a key signature and asked for the minor key, you can do this quickly and accurately.

Method 1: Find the relative major, then go to its 6th scale degree

  1. Identify the major key from the key signature.
  2. The relative minor starts on scale degree 6 of that major scale.

Example: Key signature has 2 sharps.

  • 2 sharps = D major.
  • Scale degree 6 of D major is B.
  • Relative minor is B minor.

Method 2: Move down a minor third from the major tonic

  • From D down a minor third is B → B minor.

Method 3: Use the “up a whole step from the last sharp” rule, then derive minor
For sharp key signatures, many students find major quickly by going up a half step from the last sharp. Once major is known, derive the relative minor.

For flat key signatures, major is usually the second-to-last flat (except F major with one flat). Then derive the relative minor.

Telling major vs. minor in actual music (beyond the key signature)

Because the same key signature can represent a major or a minor key, you use musical evidence:

  • Tonic emphasis: Which pitch feels like “home” (often the final pitch or the most stable resting point)?
  • Cadences and leading tones: In minor, you often see the raised 7 (leading tone) near cadences.
  • Harmonic context: Minor keys commonly feature i, iv, and V (or V7) with accidentals raising scale degree 7.

Example: A piece with no sharps/flats could be C major or A minor.

  • If you see frequent G# leading to A, and the music cadences on A minor harmony, that strongly indicates A minor.

Why minor key signatures don’t “include” harmonic/melodic minor

It can feel inconsistent that we don’t just add the raised 7 (and sometimes raised 6) into the key signature. The reason is musical flexibility:

  • Minor-mode music changes 6 and 7 depending on context (melody direction, cadence strength, harmonic function).
  • A fixed key signature would constantly be “wrong” for some passages.

So think of the minor key signature as the baseline natural minor collection, with additional accidentals used as expressive tools.

Worked examples: identifying minor keys from key signatures

1) Key signature: 4 flats.

  • Major key: A♭ major.
  • Relative minor (scale degree 6): F.
  • Minor key: F minor.

2) Key signature: 3 sharps.

  • Major key: A major.
  • Relative minor: F# minor.
  • If the excerpt ends on F# and uses E# (raised 7 in F# minor), that confirms F# minor.
Exam Focus
  • Typical question patterns:
    • “Given this key signature, name the relative minor (or identify the key as major/minor based on the excerpt).”
    • “Circle the raised leading tone accidentals in this minor-key melody and explain their function.”
    • “Write the key signature for ___ minor.”
  • Common mistakes:
    • Assuming the key signature alone proves a piece is major or minor—always look for tonic/cadence evidence.
    • Adding raised 7 (or raised 6 and 7) into the key signature for minor. Those are usually written as accidentals.
    • Confusing relative minor with parallel minor (same tonic, different key signature).

Melody and Melodic Motion

What melody is (in theory terms) and why motion matters

A melody is a sequence of pitches organized in time that listeners hear as a single musical line. In AP Music Theory, melody isn’t just “the tune”—it’s also something you analyze and write using concepts like scale degrees, tendency tones, and melodic motion.

Melodic motion is how the melody moves from one note to the next. Motion matters because it shapes:

  • Singability (stepwise lines are generally easier to sing)
  • Direction and momentum (leaps create energy; steps create smoothness)
  • Tonal clarity (certain scale degrees strongly imply a key)
  • Phrase structure (how a melody builds, peaks, and comes to rest)

In minor keys, melodic motion is especially tied to the choice of natural vs. harmonic vs. melodic minor—melodies often raise 6 and/or 7 specifically to control how the line moves.

Basic categories of melodic motion

When describing motion between successive notes, you’ll use these terms:

  • Repeated note: the same pitch occurs again.
  • Step: movement by a second (major or minor).
  • Skip: movement by a third.
  • Leap: movement by a fourth or larger.

Two larger style descriptors are also common:

  • Conjunct motion: mostly stepwise (smooth, connected).
  • Disjunct motion: includes many skips/leaps (more angular).

Why these labels matter: They help you predict and evaluate how a line will behave—especially in sight-singing and free-response melodic writing.

Tendency tones in minor: how scale degrees “want” to move

In tonal music, some notes have strong tendencies:

  • Scale degree 7 (leading tone) tends to resolve up to tonic when it’s raised (harmonic/melodic minor). In A minor, G# strongly pulls to A.
  • Scale degree 2 often resolves to 1 (especially at cadences).
  • Scale degree 6 in minor becomes important because its raised/lowered forms change melodic direction and harmonic color.

A practical way to think about this: tendency tones are like “unfinished sentences”—they sound like they’re pointing somewhere.

Melodic minor as a motion strategy (not just a scale to memorize)

It’s easy to memorize “melodic minor raises 6 and 7 ascending,” but the deeper idea is melodic problem-solving.

Suppose you’re in A minor and your melody is ascending toward A (tonic). If you keep natural minor (F and G natural), the last stretch is:

  • F → G → A

That’s perfectly stepwise, but you lose the strong leading tone pull. If you use harmonic minor, you get:

  • F → G# → A

Now the cadence is strong, but F to G# is an augmented second—often awkward to sing and stylistically prominent.

Melodic minor gives you:

  • F# → G# → A

Now you have both a strong leading tone and smooth stepwise motion. That’s why melodic minor exists: it aligns tonal pull with singable motion.

Contour, range, climax, and sequence (bigger-picture melodic shape)

Melody isn’t only about interval-to-interval movement; it’s also about overall shape.

  • Contour: the general up-and-down shape of the line. Does it rise gradually? Does it zig-zag? Does it fall at the end of phrases?
  • Range: the distance between the lowest and highest notes. Wider range can feel more dramatic; narrower range can feel more speech-like or focused.
  • Climax: the highest (or most intense) point in a phrase—often placed strategically rather than randomly.
  • Sequence: a pattern repeated at a different pitch level (for example, a motive transposed up a step). Sequences create coherence and are common in AP-style melodic analysis.

Why this matters for AP Music Theory: In sight-singing and melodic dictation, noticing contour and sequence helps you “chunk” information, rather than processing every note as brand new.

Common-practice melodic conventions (useful for writing and analysis)

AP Music Theory often emphasizes “common-practice period” melodic tendencies. These are not unbreakable laws, but they are strong norms:

  1. Stepwise motion is primary: many good melodies move mostly by step, with leaps used for emphasis.
  2. Leaps tend to be compensated: after a leap, melodies often change direction and move by step (this helps the line feel balanced and singable).
  3. Large leaps are used carefully: intervals larger than a fifth are less common in simple chorale-style writing.
  4. Tendency tones resolve: the raised leading tone typically goes to tonic, especially in cadential contexts.

In minor, a particularly relevant convention is:

  • If scale degree 7 is raised (leading tone), it often resolves up to 1 rather than moving elsewhere. If you raise it and then don’t resolve it, the line can sound stylistically odd unless there’s a clear reason.

Examples: analyzing melodic motion in minor

Example 1: Identify conjunct/disjunct and the role of raised 7
Melody (A minor context): A B C D E F G# A

  • Motion: entirely stepwise (conjunct).
  • The note G# is the raised 7 (leading tone) from harmonic/melodic minor behavior.
  • Function: it intensifies the pull into the final A, making the ending feel more final.

Example 2: Spot the “melodic minor” fingerprint
Ascending fragment in D minor: D E F G A B C# D

  • If you see B natural and C# in D minor, that’s raised 6 and raised 7.
  • Interpretation: the melody is using ascending melodic minor to approach D smoothly and strongly.

Example 3: Leap compensation
In E minor, suppose a melody goes: E G (a skip of a third) then F# then E.

  • The skip adds interest.
  • The line then moves by step and changes direction to settle back toward tonic. That’s a typical “leap then stepwise recovery” strategy.

Melody in AP skills: sight-singing and dictation connections

Even though this section is about “minor scales and melody,” it directly supports two major AP skills:

  • Sight-singing: Knowing minor collections helps you anticipate accidentals (raised 7 at cadences; raised 6 in ascending melodic passages). Thinking in scale degrees (rather than letter names) helps you sing accurately.
  • Melodic dictation: Recognizing common minor patterns (like leading-tone to tonic at the end, or a melodic-minor ascent) helps you notate what you hear.

A helpful strategy is to listen (or look) for “structural tones” first:

  • Where does the phrase end (tonic or dominant)?
  • Does scale degree 7 appear raised near the end?
  • Is the line mostly stepwise with a few leaps that outline a triad?

What goes wrong most often in minor melodies

Students often struggle in minor because they treat the scale as fixed. In real tonal melodies, minor is fluid:

  • Natural minor notes are common in the middle of phrases.
  • Harmonic minor leading tones appear near cadences.
  • Melodic minor raising of 6 and 7 often appears in ascending lines.

If you expect that flexibility, accidentals stop feeling like “random exceptions” and start feeling like clues.

Exam Focus
  • Typical question patterns:
    • “Describe the melodic motion (conjunct/disjunct) and identify notable leaps/skips in this excerpt.”
    • “In this minor melody, identify where harmonic minor or melodic minor is implied (raised 7, raised 6 and 7).”
    • “Sight-singing prompts in minor: perform a melody that includes accidentals consistent with harmonic/melodic minor.”
  • Common mistakes:
    • Treating any accidental as a modulation: raised 7 (and sometimes raised 6) is normal in minor and often does not indicate a new key.
    • Mislabeling intervals by counting incorrectly (for example, calling a third a leap instead of a skip). Count letter names first, then quality.
    • Ignoring tendency tones: raising 7 but not hearing/singing its pull to tonic often leads to pitch errors in sight-singing and dictation.