Unit 8: Modes and Form

Mode

A way of organizing pitches by a specific whole-step/half-step pattern AND a specific tonal center (home pitch), creating a distinct diatonic “flavor” beyond major/minor.

Tonal center

The pitch that feels like “home” or rest in a passage; often suggested by the final note, a frequently repeated pitch, or cadential arrival.

Final (modal tonic)

The modal “tonic” pitch a melody/harmony is anchored to; many modal melodies end on this pitch.

Characteristic tone

A scale degree that most strongly identifies a mode (e.g., #4 in Lydian, b7 in Mixolydian, natural 6 in Dorian, b2 in Phrygian).

Leading tone

Scale degree 7 a half-step below tonic that tends to resolve up to 1; strong leading-tone pull is typical of major/minor tonality and often weakened/avoided in modal contexts.

Authentic cadence

A strong tonal cadence built on dominant-to-tonic function (V–I or V7–I), typically reinforced by leading-tone resolution (7→1).

Modal cadence

A sense of ending/closure in modal music that relies more on melodic arrival on the final and characteristic tones than on strong V–I dominant function.

Reciting tone

A pitch frequently emphasized or repeated in chant-like/modal melodies, helping establish the mode’s center and hierarchy.

Ionian

The diatonic mode equivalent to the major scale (no alterations relative to major).

Dorian

A minor-type mode: natural minor (Aeolian) with a raised 6; often identified by a “minor sound” plus natural 6 and a major IV chord in harmony.

Phrygian

A minor-type mode: natural minor (Aeolian) with a lowered 2; characterized by the intense b2 (half-step above tonic) and often the bII chord.

Lydian

A major-type mode: major (Ionian) with a raised 4; characterized by #4, creating a bright sound and weakening the usual 4–3 pull.

Mixolydian

A major-type mode: major (Ionian) with a lowered 7; characterized by b7 (no leading tone) and common use of the bVII chord (e.g., I–bVII–IV).

Aeolian

The diatonic mode equivalent to the natural minor scale (no alterations relative to natural minor).

Locrian

A diatonic mode like natural minor with lowered 2 AND lowered 5; its tonic triad is diminished, making stable tonic function difficult and the mode relatively rare.

Mode mixture (borrowed chords)

A tonal technique in major/minor keys where chords are borrowed from the parallel major/minor for color (not the same thing as being “in a mode”).

Modality

A pitch organization where a mode (not major/minor functional tonality) is the primary system, typically shown by consistent modal scale degrees and weaker/avoided dominant function.

Pentatonic scale

A five-note scale; a key identifying feature is that it contains no half steps, reducing typical leading-tone/tendency-tone behavior.

Major pentatonic

A pentatonic collection associated with major; one construction method is taking five consecutive pitches on the circle of fifths and reordering them into a scale.

Relative minor pentatonic

A pentatonic scale sharing pitch content with a major pentatonic but starting on its relative minor (e.g., A minor pentatonic uses the same pitches as C major pentatonic).

Blues scale

A common six-note blues collection: 1, b3, 4, b5, 5, b7 (often featuring “blue notes” like b3 and b5).

Whole-tone scale

A six-note (hexatonic) scale in which every adjacent pitch is a whole step apart.

Heptatonic

A seven-tone scale type (e.g., major and minor scales; the seven diatonic modes are heptatonic).

Hexatonic

A six-tone scale type (e.g., the whole-tone scale).

Whole-step/half-step (W/H) pattern

The intervallic step pattern that defines a scale or mode (e.g., Ionian: W W H W W W H); placing half steps incorrectly changes the mode/spelling.

Alteration method (building modes)

A way to construct modes by starting with the parallel major (Ionian) or natural minor (Aeolian) on the same tonic and altering the characteristic scale degree(s) (e.g., Mixolydian = major with b7).

Enharmonic spelling (letter-name sequence)

Notating scales so each letter name appears once in order (A–B–C–D–E–F–G); AP-style notation expects correct spelling, not just correct sounds.

Form

The large-scale organization of a piece—how musical ideas are introduced, repeated, contrasted, varied, and brought back across time.

Motive

A short, recognizable musical idea (rhythmic cell, interval pattern, or melodic fragment) that can be repeated and developed.

Phrase

A musical “thought” that typically leads to a cadence; phrases are key building blocks of small and large forms.

Cadence (as a form marker)

Harmonic/melodic punctuation that signals closure and helps define phrase and section boundaries (often the strongest evidence for labeling form).

Theme

A longer, more complete musical idea than a motive, often made of multiple phrases and used as primary material for sections.

Section (formal unit)

A large division of a piece (e.g., A, B, A′) that may contain one or more themes and multiple phrases.

Period

A two-phrase unit where the first phrase (antecedent) is less conclusive and the second (consequent) answers with stronger closure.

Antecedent phrase

The first phrase of a period, typically ending with weaker closure (often creating expectation for an answering phrase).

Consequent phrase

The second phrase of a period that responds to the antecedent and typically ends with stronger cadence/closure.

Sentence (phrase structure)

A phrase design often heard as presentation (basic idea + repetition/variation) followed by continuation (drive toward cadence, often with fragmentation and faster harmonic rhythm).

Fragmentation

A continuation technique where musical units break into shorter pieces (smaller motives), often increasing energy and pushing toward a cadence.

Binary form

A two-part design (A–B), often with repeats; A commonly departs from tonic to another key area, and B explores and returns to tonic.

Rounded binary

A two-part form that includes a return of A material near the end of the B section (often described as A | BA′), creating an A–B–A-like effect within a binary framework.

Ternary form

A three-part design (A–B–A) where the final A is a full returning section after a contrasting middle (often labeled A′ if varied).

Minuet and trio

A large-scale ternary movement design: Minuet (A), Trio (B), Minuet (A) returns (often da capo); each internal section is commonly binary/rounded binary.

Rondo

A form featuring multiple returns of a main theme (A) alternating with contrasting episodes (e.g., A–B–A–C–A).

Theme and variations

A form where a theme is stated and then repeated in altered versions (changes in rhythm, texture, mode, reharmonization, etc.) while remaining recognizable through underlying structure.

Strophic form

A vocal form in which the same music repeats for multiple stanzas/verses of text.

Through-composed

A vocal form with new music for each stanza/section of text, avoiding large-scale musical repetition.

Verse

A repeated song section that typically changes lyrics each time and often advances the narrative/message.

Chorus

A repeated song section that usually contains the main hook and returns with largely the same lyrics and music.

Refrain

A repeated line or phrase (often at the end of each verse or chorus) that recurs without necessarily being a full separate section.

Coda

A concluding section added after the main formal closure to provide extended ending/confirmation, sometimes recalling earlier material.