Minor Scales: Natural, Harmonic, and Melodic
Learn the three minor scale forms, their step patterns, and how raised scale degrees appear as accidentals in notation and as distinctive sounds in performed music.
AP Music Theory Unit 2 Review: Minor Scales and Key Signatures, Melody, Timbre, and Texture
- 13 topics
- AP exam review verified for 2027
Unit 2 is about understanding pitch organization in minor keys, measuring and inverting intervals, describing melodic and textural features by ear and in notation, identifying instrumental timbres, and recognizing rhythmic devices like syncopation and hemiola.
Fiveable's AP Music Theory Unit 2 review covers 13 topics, with guided practice questions for the unit.
AP Music Theory unit 2 topics
Relative Keys: Determining Relative Minor Key and Notating Key Signatures
Find the relative minor by going to scale degree 6 of the major key. Both keys share the same key signature but have different tonics.
Key Relationships: Parallel, Closely Related, and Distantly Related Keys
Parallel keys share a tonic; closely related keys differ by no more than one accidental; distantly related keys differ by more than one accidental.
Other Scales: Chromatic, Whole-Tone, and Pentatonic
Identify chromatic (12 half steps), whole-tone (6 whole steps), and pentatonic (5 pitches, no half steps) scales by ear and in notation.
Interval Size and Quality
Name every interval by size (count letter names) and quality (count half steps). Distinguish harmonic from melodic intervals and consonant from dissonant intervals.
Interval Inversion and Compound Intervals
Invert an interval by moving the lower note up an octave; sizes sum to 9 and quality flips predictably. Compound intervals exceed an octave.
Transposing Instruments
Convert written pitch to sounding pitch using the interval and direction given in the question. The exam always provides the transposition level and direction.
Timbre
Identify instrument families, specific instruments, voice types, and ensemble types by their distinctive sound quality and register in performed music.
Melodic Features
Describe melody using contour, conjunct and disjunct motion, range, register, and motive. Recognize how motives are developed through transposition, inversion, and augmentation.
Melodic Transposition
Move a melody to a new pitch level while preserving every interval and rhythmic value. The tune sounds identical but higher or lower.
Texture and Texture Types
Classify texture as monophony, homophony (chordal or melody with accompaniment), polyphony (imitative or nonimitative), or heterophony based on the number and independence of melodic lines.
Texture Devices
Identify specific techniques like Alberti bass, walking bass, canon, imitation, countermelody, ostinato, doubling, solo/soli, and tutti in performed and notated music.
Rhythmic Devices
Recognize syncopation, hemiola, polyrhythm, borrowed divisions, asymmetrical meter, and changing meter in both performed and notated music.
Practice AP Music Theory unit 2 questions
Try AP-style questions on unit 2, then use the review notes below for anything you miss.
Unit 2 review notes
2.1
The Three Forms of Minor Scale
All three minor scale forms share the same key signature, which matches natural minor. Raised scale degrees appear as accidentals in the score, not in the key signature. The augmented second between scale degrees 6 and 7 in harmonic minor is a distinctive sound to recognize by ear.
- Natural minor: W-H-W-W-H-W-W; scale degrees 6 and 7 are both lowered relative to major; also called Aeolian mode.
- Harmonic minor: Raises scale degree 7 by a half step to create a leading tone; produces an augmented second between degrees 6 and raised 7.
- Melodic minor: Raises both degrees 6 and 7 ascending to smooth the augmented second; descends as natural minor.
- Leading tone: The raised 7th degree in harmonic and ascending melodic minor; a half step below the tonic, creating strong upward pull.
- Augmented second: The interval between lowered 6 and raised 7 in harmonic minor; one semitone larger than a major second, avoided in traditional voice leading.
Write A natural minor, A harmonic minor, and A melodic minor (ascending and descending) on staff paper. Mark which scale degrees are raised and where the augmented second appears.
| Scale form | Scale degree 6 | Scale degree 7 | Distinctive feature |
|---|---|---|---|
| Natural minor | Lowered | Lowered (subtonic) | No leading tone |
| Harmonic minor | Lowered | Raised (leading tone) | Augmented second between 6 and 7 |
| Melodic minor (asc.) | Raised | Raised (leading tone) | Smooth stepwise ascent |
| Melodic minor (desc.) | Lowered | Lowered | Same as natural minor |
2.2
Relative, Parallel, and Closely Related Keys
Relative keys share a key signature but have different tonics. Parallel keys share a tonic but have different key signatures. Closely related keys differ from the original by no more than one accidental; distantly related keys differ by more than one. On the aural section, you identify the type of key relationship, not the letter name of the key.
- Relative minor: Found by going down a minor third from the major tonic, or to scale degree 6; shares the same key signature as its relative major.
- Parallel key: Shares the same tonic as the original key but has a different key signature and mode; for example, D major and D minor.
- Closely related keys: Keys whose key signatures differ from the original by no more than one accidental; the most common destinations for modulation.
- Distantly related keys: Keys whose key signatures differ by more than one accidental from the original.
- Circle of fifths: A diagram showing all major and minor keys arranged by key signature; adjacent keys are closely related.
For D major, list all closely related keys. Then identify the parallel minor and explain how its key signature differs.
| Relationship | Shared element | Different element | Example |
|---|---|---|---|
| Relative | Key signature | Tonic pitch | C major / A minor |
| Parallel | Tonic pitch | Key signature and mode | D major / D minor |
| Closely related | Differ by 0-1 accidental | Tonic and/or mode | G major neighbors of C major |
| Distantly related | Neither tonic nor signature | Differ by 2+ accidentals | C major and F# major |
2.4
Chromatic, Whole-Tone, and Pentatonic Scales
These three scale types appear in both performed and notated music. Each has a distinctive interval pattern and sound that makes aural identification possible. Major pentatonic uses scale degrees 1, 2, 3, 5, and 6 of the major scale; minor pentatonic uses degrees 1, 3, 4, 5, and 7 of the natural minor scale.
- Chromatic scale: Twelve pitches, each a half step apart; all semitones, no whole steps.
- Whole-tone scale: Six pitches, each a whole step apart; no half steps, no leading tone, associated with Impressionist composers like Debussy.
- Major pentatonic: Five pitches: scale degrees 1, 2, 3, 5, 6 of the major scale; no half steps, common in folk and popular music.
- Minor pentatonic: Five pitches: scale degrees 1, 3, 4, 5, 7 of the natural minor scale; common in blues and folk traditions.
Identify each scale type by its interval pattern: all half steps, all whole steps, or five pitches with no half steps. Practice singing or playing each to internalize the sound.
| Scale | Pitch count | Interval pattern | Characteristic sound |
|---|---|---|---|
| Chromatic | 12 | All half steps | Dense, no tonal center |
| Whole-tone | 6 | All whole steps | Floating, ambiguous, no leading tone |
| Major pentatonic | 5 | W-W-m3-W-m3 | Bright, open, no half steps |
| Minor pentatonic | 5 | m3-W-H-W-m3 | Dark, bluesy, no half steps |
2.5
Interval Size, Quality, Inversion, and Compound Intervals
Naming an interval requires two pieces of information: size (count letter names inclusively) and quality (count exact half steps). Inversion flips the interval by moving the lower note up an octave; size numbers sum to 9 and quality changes predictably. Compound intervals are simple intervals plus an octave.
- Interval size: Count letter names inclusively from the lower to the upper note; for example, C to G spans five letter names, so the size is a fifth.
- Interval quality: Determined by the exact number of half steps; qualities are perfect, major, minor, augmented, or diminished.
- Tritone: The augmented fourth or diminished fifth; the most dissonant simple interval, dividing the octave exactly in half.
- Sum-to-nine rule: An interval and its inversion always have sizes that add up to 9; for example, a third inverts to a sixth (3 + 6 = 9).
- Compound interval: An interval larger than an octave; a simple interval plus an octave, such as a ninth (octave + second) or a tenth (octave + third).
Practice inverting a major sixth (becomes minor third), a perfect fifth (becomes perfect fourth), and an augmented fourth (becomes diminished fifth). Confirm each with the sum-to-nine rule.
| Original quality | Inverted quality |
|---|---|
| Perfect | Perfect |
| Major | Minor |
| Minor | Major |
| Augmented | Diminished |
| Diminished | Augmented |
2.7
Transposing Instruments
A transposing instrument sounds at a different pitch than what is written in the score. The AP exam always specifies the interval and direction of transposition in the question, so you do not need to memorize each instrument's transposition. Your task is to apply the given interval to convert written pitch to sounding pitch or vice versa.
- Written pitch: The pitch as notated in the score for a transposing instrument.
- Sounding pitch: The actual concert pitch heard when the instrument plays the written note.
- Direction of transposition: Specified in the exam question as 'sounding a [interval] above/below notated pitch'; apply the interval in the stated direction.
- Octave transposers: Instruments like the double bass that transpose by an octave only; treated as a special case on the exam.
Given 'Clarinet in Bb sounding a Major 2nd below notated pitch,' find the sounding pitch for written D. Answer: C. Practice converting in both directions.
| Conversion direction | Procedure |
|---|---|
| Written to sounding | Move the written note by the given interval in the stated direction |
| Sounding to written | Move the sounding note by the given interval in the opposite direction |
2.8
Timbre and Performance Media
Timbre is the unique sound quality of a voice or instrument, shaped by how the sound is produced and which part of the instrument's range is used. On the AP exam, timbre identification is an aural skill: you listen and identify the instrument family, specific instrument or voice type, and ensemble type.
- Timbre: The distinctive sound quality of a voice or instrument that allows identification even when playing the same pitch as another instrument.
- Tessitura: The most comfortable and frequently used register of a voice or instrument; affects the characteristic sound of a part.
- Instrumental families: Strings, woodwinds, brass, percussion, and keyboards; each family has a characteristic timbre based on how sound is produced.
- Performance media: The specific combination of voices and instruments in a piece; examples include string quartet, SATB choir, brass quintet, jazz trio, and solo piano.
- Register: The relative span of pitch (high, medium, or low) used by a voice or instrument in a given passage; affects timbre and expressive quality.
Listen to recordings of a string quartet, a brass quintet, and an SATB choir. Practice identifying the ensemble type and individual instrument or voice timbres by ear.
| Family | Sound production | Common examples |
|---|---|---|
| Strings | Vibrating strings (bowed or plucked) | Violin, viola, cello, double bass |
| Woodwinds | Vibrating reed or air column | Flute, oboe, clarinet, saxophone |
| Brass | Vibrating lips in a mouthpiece | Trumpet, French horn, trombone, tuba |
| Percussion | Striking or shaking | Snare drum, marimba, cymbals, timpani |
| Keyboards | Various mechanisms | Piano, organ, harpsichord |
2.9
Melodic Features and Melodic Transposition
A melody is pitch and rhythm combined into a musical statement. Melodic features describe how a melody moves and is organized. Melodic transposition moves a melody to a new pitch level while keeping every interval and rhythmic value identical.
- Melodic contour: The overall shape of a melody created by the rise and fall of pitches; can be ascending, descending, arch-shaped, or wave-shaped.
- Conjunct and disjunct motion: Conjunct motion moves by step (adjacent letter names); disjunct motion moves by leap (skipping one or more letter names).
- Motive: A short musical idea that recurs and is developed throughout a piece; can be transformed by transposition, inversion, augmentation, or diminution.
- Melodic transposition: Moving a melody to a new pitch level while preserving all intervals and rhythmic values; the tune sounds identical but higher or lower.
- Range: The total compass of a melody from its lowest to its highest pitch.
Identify the contour, range, and primary motion type (conjunct or disjunct) of a melody you know. Then transpose it up a major second and check that every interval is preserved.
2.11
Texture Types and Texture Devices
Texture describes how musical lines combine simultaneously. Texture type is determined by the number of lines and their melodic independence. Texture devices are specific techniques layered on top of a texture type to shape the sound further.
- Monophony: A single unaccompanied melodic line; no harmonic support.
- Homophony: One primary melody with supporting material; includes chordal homophony (all voices move together rhythmically) and melody with accompaniment.
- Polyphony: Two or more independent melodic lines sounding simultaneously; can be imitative (canon, fugue) or nonimitative.
- Heterophony: A single melody performed simultaneously in different versions or variations by two or more performers.
- Alberti bass: A texture device in which the left hand plays broken chords in a low-middle-high-middle pattern, common in Classical-era keyboard music.
- Ostinato: A persistently repeated melodic, rhythmic, or harmonic pattern in the same voice; provides a foundation for variation above it.
Listen to a Bach chorale (chordal homophony), a Bach invention (imitative polyphony), and a Gregorian chant (monophony). Practice labeling the texture type and identifying any texture devices present.
| Texture type | Number of lines | Melodic independence | Example device |
|---|---|---|---|
| Monophony | 1 | N/A | None |
| Chordal homophony | Multiple | None (move together) | Homorhythmic |
| Melody with accompaniment | Multiple | Low (one melody dominant) | Alberti bass, ostinato |
| Imitative polyphony | Multiple | High (lines imitate each other) | Canon, fugue |
| Nonimitative polyphony | Multiple | High (independent lines) | Countermelody |
2.13
Rhythmic Devices
Rhythmic devices create interest by challenging or disrupting an established meter. The three most important for AP Music Theory are syncopation, hemiola, and polyrhythm. Borrowed divisions, asymmetrical meters, and changing meter extend these concepts further.
- Syncopation: Accent placed on a weak beat or weak division, creating a temporary displacement of the expected rhythmic pulse.
- Hemiola: A 3:2 rhythmic ratio in which three notes of equal duration occupy the time of two notes of equal duration; common at cadences in Baroque and Renaissance music.
- Polyrhythm (cross-rhythm): Two or more rhythmic patterns sounding simultaneously that do not derive from the same meter; for example, two against three.
- Borrowed division: A compound division (triplet) substituted in a simple meter, or a simple division (duplet) substituted in a compound meter.
- Asymmetrical meter: A meter with beats of unequal size, such as 5/8 (grouped 3+2 or 2+3) or 7/8 (grouped 2+2+3 or other patterns).
Clap a 6/8 pattern, then shift to a 3/4 feel over the same eighth-note pulse. That shift is hemiola. Practice identifying syncopation by finding where accents fall on weak beats in a given rhythm.
| Device | What it does | Common context |
|---|---|---|
| Syncopation | Accents weak beat or division | Jazz, popular music, Baroque dance |
| Hemiola | 3:2 ratio across the barline or within a measure | Baroque cadences, Renaissance polyphony |
| Polyrhythm | Two independent metric patterns simultaneously | African music, 20th-century concert music |
| Borrowed division | Triplet in simple meter or duplet in compound meter | Romantic and 20th-century music |
| Asymmetrical meter | Beats of unequal length (5/8, 7/8) | 20th-century and folk music |
Key terms
| Term | Definition |
|---|---|
| Natural Minor | A seven-note scale following W-H-W-W-H-W-W; scale degrees 6 and 7 are both lowered relative to the parallel major. |
| Harmonic Minor | A minor scale with a raised 7th degree, creating a leading tone and an augmented second between scale degrees 6 and 7. |
| Melodic Minor | A minor scale that raises both degrees 6 and 7 ascending and returns to natural minor descending. |
| Parallel Keys | A major and minor key that share the same tonic but have different key signatures; for example, D major and D minor. |
| Closely Related Keys | Keys whose key signatures differ from the original by no more than one accidental; the most common modulation destinations. |
| Chromatic Scale | A scale of twelve pitches, each a half step apart, covering all semitones within an octave. |
| Harmonic Intervals | The distance between two pitches sounded simultaneously, described by size and quality. |
| Melodic Contour | The overall shape of a melody created by the specific rise and fall of pitches. |
| tessitura | The most comfortable and frequently used register of a given voice or instrument. |
| Polyphony | A texture with two or more independent melodic lines sounding simultaneously; can be imitative or nonimitative. |
| Ostinato | A persistently repeated melodic, rhythmic, or harmonic pattern in the same voice throughout a passage. |
| Asymmetrical meter | A meter with beats of unequal size, such as 5/8 or 7/8, creating irregular accent patterns. |
| enharmonic equivalent | Two pitches spelled differently but sounding the same, such as an augmented fourth (D to G#) and a diminished fifth (D to Ab). |
How to review unit 2
Topics students miss most
Miss rates come from Fiveable multiple-choice practice.
Common unit 2 mistakes
Confusing relative and parallel minor
Relative minor shares a key signature with its major (different tonic); parallel minor shares a tonic with its major (different key signature). D major and B minor are relative; D major and D minor are parallel. Mixing these up causes errors in both notation and aural identification.
Forgetting that melodic minor descends as natural minor
Students often raise degrees 6 and 7 in both directions. The raised 6th and 7th apply only ascending; the descending form returns to natural minor. In notation, this means the accidentals appear only on the way up.
Counting interval size incorrectly
Interval size requires inclusive counting: C to G is a fifth because you count C-D-E-F-G (five letter names). Skipping the starting note and counting only the steps above it gives the wrong size.
Applying inversion quality rules incorrectly
Only major and minor swap with each other, and only augmented and diminished swap with each other. Perfect intervals stay perfect. A common error is inverting a perfect fifth to a perfect fourth but then changing the quality to major or minor.
Labeling texture type when a texture device is asked, or vice versa
Texture type (monophony, homophony, polyphony, heterophony) and texture device (Alberti bass, canon, ostinato) are different categories. A passage can be homophonic with an Alberti bass device. Read the question carefully to determine which category is being asked about.
How this unit shows up on the AP exam
Aural identification of scales, keys, and texture
The listening section of the AP Music Theory exam asks you to identify scale types (including minor forms and pentatonic), key relationships (relative, parallel, closely related), texture types (monophony through polyphony), and texture devices by ear. Practice with recordings and focus on the distinctive sound of each category rather than relying on notation.
Notated interval and scale tasks
The written section includes tasks that require you to identify or notate intervals by size and quality, apply inversion rules, write minor scales with correct accidentals, and notate key signatures for relative and parallel keys. Accuracy in counting letter names and half steps is essential, as enharmonic spellings are not accepted as correct answers.
Score analysis combining multiple Unit 2 skills
Score-based questions may present a passage and ask you to identify the scale or mode in use, label intervals, describe melodic features such as contour and motive, identify texture type and devices, and convert written pitches for a transposing instrument. These tasks often appear together, so practicing them as an integrated set rather than in isolation prepares you for the full range of score-reading demands.
More ways to review
Topic study guides
Open the individual guides for Unit 2 when you want a closer review of one topic.
Practice questions
Use AP-style practice after you review the notes so you can check what you understand.
FRQ practice
Practice free-response reasoning and compare your answer with scoring guidance.
Cram archive videos
Watch past review streams filtered to Unit 2 when you want a video walkthrough.
Official unit cheatsheet
Open the Fiveable one-page unit review, then explore visual cheatsheets for a quick refresher.
Score calculator
Estimate your broader AP score goal after you review the course and exam format.
Unit 2 printables
Print the unit cheatsheets ($3) for Unit 2. Yours to keep, no subscription needed.
get printablesFrequently Asked Questions
What's on the AP Music Theory Unit 2 progress check (MCQ and FRQ)?
The AP Music Theory Unit 2 progress check tests texture, minor scales, key signatures, and intervals across both its MCQ and FRQ parts. The MCQ section asks you to identify scale types, determine relative and parallel keys, classify interval size and quality, and recognize texture types. The FRQ section typically asks you to notate key signatures, write or identify intervals, and analyze melodic or textural features in a short excerpt. The progress check draws from all 13 topics in Unit 2, so pay close attention to interval inversion (2.6), melodic transposition (2.10), and texture devices (2.12), since those show up as both multiple-choice questions and short written tasks. Practice with aligned questions at AP Music Theory Unit 2.
How do I practice AP Music Theory Unit 2 FRQs?
AP Music Theory Unit 2 FRQs most often come from key signatures, minor scales, intervals, and melodic transposition, so those are the skills to drill first. Typical question types include notating a key signature on the staff, writing a natural or harmonic minor scale, identifying or writing a specific interval, and transposing a short melody to a new key or clef. To practice effectively, write out all three forms of minor scales (natural, harmonic, melodic) from memory, then practice notating key signatures up to four sharps and flats. For melodic transposition (topic 2.10), take a short melody and move it to a different pitch level, checking that every interval relationship stays intact. Texture and timbre questions (topics 2.11-2.12) show up less often as standalone FRQs but appear in analysis prompts, so practice labeling monophony, homophony, and polyphony in short excerpts. Find practice prompts at AP Music Theory Unit 2.
Where can I find AP Music Theory Unit 2 practice questions?
The best place to find AP Music Theory Unit 2 practice questions, including multiple-choice and practice test sets, is AP Music Theory Unit 2. That page has MCQ-style questions covering minor scales, key signatures, interval size and quality, texture types, and melodic transposition, which are the core skills tested in this unit. For a full practice test experience, work through questions on each of the 13 topics in order. Focus your MCQ practice on interval identification (topics 2.5-2.6) and key relationships (topics 2.2-2.3), since those appear most frequently. For written practice, College Board's AP Classroom also has a Unit 2 progress check with both MCQ and FRQ sections.
How should I study AP Music Theory Unit 2?
Studying AP Music Theory Unit 2 well means building skills in a specific order: start with minor scales and key signatures before moving to intervals, melody, and texture. These concepts stack on each other, so rushing ahead without locking in the earlier material makes the later topics harder. Here's a concrete plan:
1. Minor scales first. Write out natural, harmonic, and melodic minor scales from every starting note until it's automatic. Notice how the raised 7th (harmonic) and raised 6th and 7th (melodic) change the pattern.
2. Key signatures next. Use the circle of fifths to connect major keys to their relative minors. Knowing that A minor shares a key signature with C major (topic 2.2) cuts your memorization in half.
3. Intervals daily. Drill interval size and quality (topic 2.5) and interval inversion (topic 2.6) with short daily quizzes. Intervals are the building block for everything in Units 3 and beyond.
4. Melodic transposition. Practice moving short melodies to new keys or clefs (topic 2.10). Check that every interval between notes stays the same after transposing.
5. Texture and timbre last. Learn to label monophony, homophony, polyphony, and heterophony (topic 2.11) by listening to short excerpts, then identify texture devices like imitation and ostinato (topic 2.12). Track your progress and find practice sets at AP Music Theory Unit 2.