This skill governs "what blocks this song is made of, how long each block is, and in what order."
Its division of labor with mc-arrangement-arch is the easiest place in this library to mix up:
mc-formgoverns what the form is (music theory and conventions);mc-arrangement-archgoverns why this song is divided this way (decisions and asymmetry).
Specifically:"The chorus is usually 8 bars" goes to form; "this song's second verse needs to be 14 bars because it has to break the even number" goes to arrangement-arch.
Which sections to read by task
| Task | Read |
|---|---|
| Lay out a song's structure | §2 Templates → §5 Backwards design |
| Section terminology doesn't line up | §1 Comparison table (★ two are often mistranslated) |
| Sections blur into one another | §4 ＋ mc-arrangement-arch §4 |
| Whether to add a C section/bridge | The composition choices in §5 |
| Making EDM / club music | §2.5 |
| How to enter at the beginning | §3 |
| Pop terminology is no longer enough | §6 Classical formal devices |
| Fill in the form table of ARR-SPEC | §7 |
Boundaries
| Not handled here | Where it goes |
|---|---|
| Why this section should be 14 bars instead of 16 (asymmetric design) | mc-arrangement-arch §4 |
| Energy curve, entrance and exit events | mc-arrangement-arch |
| How a motif develops into a phrase, what a section does with old material | mc-development; syncopation and call-and-response within a phrase still remain in mc-melody §7 |
| How to modulate between sections | mc-modulation |
| How to harmonize the chorus | mc-harmony |
| A style's typical song form | mc-style-*（L3） |
| The structure of film and television scoring (follows the picture, not the form) | Scoring (writing music for the picture) is not part of this package; for the sections and durations this package hands off, see mc-workflow §5 |
| The complete classification of classical forms and score examples | reference.md |
1. Section Terminology Comparison
Japanese (J-POP) terminology and English-American terminology are not one-to-one; clarify before analyzing or communicating.
| Japanese | Chinese / English-American | Function |
|---|---|---|
| A melody | Verse (Verse, flat song) | Introductory section. Narrow range, short note values, "narrative"-style singing; lyrics tell a concrete story and set the scene |
| B melody | Pre-chorus | ★ A "second verse" unique to Japan: a section between the A-melo and the chorus with a different character, gradually raising the register and building anticipation |
| Chorus | Chorus | The section where the song's climax lies: highest register, greatest density, most memorable; carries the core message |
| C melody / D melody | Third development section (the bridge's position) | Completely new melody/harmony/rhythm appearing after the second verse, creating "unexpected development" |
| Grand chorus | ≈ English-American bridge / middle eight | ★★ It is not a "bigger chorus"! Its character is closer to a "second B-melo": introspective, restrained, often with a half-time feel;it is always followed by a chorus |
| Opening chorus | Opens with the chorus | The first second is already the chorus, immediately grabbing your memory |
| Ochisabi | The "falling" chorus | The same chorus melodysuddenly switches to an extremely sparse arrangement(such as only piano + vocals), moving listeners through the contrast |
| Kime | Unison accent / closing phrase | A flag-planting phrase about 2 bars long attached to the end of the chorus, where the accompaniment suddenly stops or plays a signature rhythm while the theme word is sung |
| Intro | Intro | |
| Kansou | Interlude | In English it is called Second Introduction—"the intro to the second round of verses and choruses" |
| Outro / Kousou | Outro | An instrumental ending |
| Vamp | Groove section | A section that does not play a melody and only presents a rhythmic pattern (it can be percussion only, or add bass/guitar) |
| Coda | Coda | Added after the final round of sections ends,sungsection |
| 1st verse / 2nd verse | First round / second round | One round of verse and chorus = one "section"; same melody + different lyrics + slight arrangement changes—an anti-fatigue device refined over generations |
| Break | Break | The moment when the accompaniment stops completely and only vocals remain |
| Fill | Fill | A drum fill at the seam between sections, igniting anticipation in advance |
★★ The two most easily mistranslated：
- Oosabi ≠ big chorus, it is the bridge
- Japanese "heikouchou" = relative major/minor, not the English parallel key (that is "dou shuchou")—see
mc-modulation§2
Levels of melodic method: partial motive → motive → small phrase → phrase → section → whole song.
The melodic-method definition of sabi: the phrase that serves as the climax within the larger unit of the "section." At each level, the size of the climax is proportional to the size of that level's block.
2. Standard templates
2.1 Two major categories by chorus position
| Type | Shape | Description |
|---|---|---|
| Expanding type(opening wider as it goes on) | [A→B→サビ] or [A→サビ] |
All sections other than the sabi are "setting the table."The vast majority of modern J-POP belongs to this category |
| Cyclic resolution type | [A→サビ→A] or [サビ→B→サビ] |
The melody returns to the beginning at the end (three-part form,principle of return). Common in 1960s music, enka/kayokyoku/jazz standards, increasingly rare today |
2.2 The royal-road full-song template (expanding type)
Intro → 1A → 1B → 1サビ → (间奏1)
→ 2A → 2B → 2サビ → 间奏2
→ Cメロ(大サビ) → 3サビ(可转调) → (3サビ2) → 尾奏
Key points：
- The A−B−sabi three-part structure is the most common form in Japanese pop(melodic method: a pure three-part structure of a−b−c = exposition − shift in perspective − comprehensive resolution)
- Why there is a "2nd verse": same melody + slightly changed sound + completely different lyrics, an anti-fatigue device
- After the 2nd verse, insert a C-melo/bridge (which can have an entirely new melody, harmony, and rhythm) to continue preventing fatigue and raise the tension, then give the sabi once more
- ★ Omitted-repetition rule: 1st section
A−A'−B−C→ 2nd sectionA−B−C→ The 3rd section can start directly from the sabi - As a rule, a whole song 2–3 sections, 3–5 minutes; slow songs reduce the number of sections, fast songs increase it (when the BPM differs by more than 3 times, balance it by the number of sections)
-
The only true standard: the listener is neither bored because it is too long nor feels cheated because it is too short, and finishes satisfied.
2.3 Ternary form template (サビ in the middle)
A(melo) → B(サビ) → A'(melo) ×2–3 节
- The pillar isthe principle of return: B develops the content of A more emotionally (or narrates from a broader perspective), and returning to A brings "deep realization and wistfulness"
- The continuity between A and B is usually stronger than in the Verse=Chorus type
- Expanded form A−A'−B−A'' = the classic 起承转合 structure
- Rare variant A−B−C: the final section does not return to A, but is made into a melody that "repeatedly lands on the same note, fading as it closes,"and still sounds like coming home
2.4 Quick reference for other forms
| Form | Structure |
|---|---|
| Binary form | A (verse) − B (chorus): the basic form of Western pop/rock |
| Inserted-bridge form | A − (short bridge) − サビ: do not write a full second verse, just insert a short connecting passage (raise the register, heat it up) |
| Compound ternary | [A−B−A]−[C−D−C]−[A−B−A] |
| Hybrid form | A−B−サビ−A(return of the verse after Verse=Chorus) |
| One-section construction | Chorus only / verse only: counting songs, narrative ballads, loop-based dance music |
| Commercial jingle | Cram A/B/サビ into 15/30 seconds; the development must be extremely clear;use changing time signatures for "length adjustment" |
2.5 EDM / club music variants
Intensity is piled up on a much longer time scale than in song-type music:
four-on-the-floor 底鼓起
→ 加 hi-hat
→ 加钢琴之类的持续伴奏（以 8+ 小节为单位重复）
→ 正式前奏 → A メロ → サビ
→ 回到只有鼓的段落 → 循环……
- Features:melody is optional; the structure is long and large; there are passages with only drums or only pads, sothe contrast in thickness is extremely sharp; arrange with the drums at the center
- Two reasons this structure works: (1) piling up slowly is better suited to dancing; (2) passages with only drums make it easy for the DJ to transition to the next track
- ★ A structure that feels long-winded and boring when listened to at home is extremely effective on the dance floor—purpose determines form
- The section construction of dance music is often A−A−A−…−A'−B: repeat one motif many times in the verse + one short chorus
- Extreme form: only one motif within a section (a a a a).Repetition seeps into the unconscious and evokes a half-involuntary bodily reaction— even without a big climax, repetition itself constitutes the buildup
3. How to enter at the beginning
Outside the main song, add an introductory section at the very top of the piece; both major categories of form can use it:
| Method | Approach |
|---|---|
| Spoken-style opening section(quiet introduction) | Mid register + pitch that barely moves + simple rhythm + accompaniment with static harmony, even free tempo—begin from a state "between speech and song" and smoothly lead the listener into the world of the work (extremely common in opera and musicals). Forms:D(引子) − [A−B−サビ] − [A−B−サビ] |
| Elevated introduction(the reverse) | The intro begins with an elevated passage (leaps + high register), creating a huge gap from everyday life and yanking the listener in all at once |
| 頭サビ | Intro can directly use the chorus—the most common option。C−[A−B−C]−[A−B−C]（Verse=Chorus）；B−[A−B−A](three parts). ★ Two approaches: played as-is = a dazzling opening; thin accompaniment + slow tempo + rubato = a smooth narrative-style lead-in |
4. There must be contrast between sections
The root cause of sections blurring together is that adjacent sections are identical in too many dimensions. The specific means of contrast are in reference.md §1; here only the criterion is given:
Self-check action: check adjacent sections on these six items— register / rhythmic density / harmonic rhythm / instrumentation thickness / vocal delivery / phrase length。 If fewer than two items differ, these two sections will be heard as the same section.
5. ★ Design backwards: work back from the chorus
The design principle is always "work backwards with the chorus as the center."
| Structure | How to design |
|---|---|
| A structure(single section) | No change of character, plain and simple. When a dance track repeats the same riff, there may even be only one motive within the section (a a a a) |
| A−B structure(Verse=Chorus basic form) | Two-part structure principle; common in Western rock/R&B, strong catchiness.If the chorus already exists → work backwards to "what kind of A can lead into it"; if A already exists → think about what kind of chorus it should lead into. ★ The chorus must not only have impact at the beginning, but also have a sufficient climax in the latter half |
| A−B−C structure(Japanese royal road) | ★ First think of the chorus (C) and the intro section A, decide the plan for the middle part, and write B last |
| A−B−A structure(three parts) | At the end of the section, stage "deep wistfulness" or "the openness of resolution." ★ To make the recapitulation effect fully pay off, the standard approach is to make B's character change drastically |
Two ways to write the B section(in an A−B−C structure):
- B as a bridge: restrained A → B with rhythm-emphasizing short motive repetition and register stepping up level by level → C with groove
- B as a second verse: light A → introspective, quiet B → C whose sense of elevation is doubled by the drop (B's latter half-section can be made into a short bridge that builds upward and leads into C)
5.1 ★ Extension warning
In
A−B−C → A−B−C−Dbefore adding elements like this, first consider extending by "section repetition." Too many elements → the path to the chorus becomes winding and the focus scatters.
This is a criterion of order of operations, not "adding sections is forbidden": first see whether the length can be filled out using the techniques already listed in the table above (for example, the whole-section repetition of the riff in an A structure, or the short bridge built into the end of the B section in A−B−C). If it cannot be filled out enough and contrast can no longer be created, then consider adding new elements. Whether to add them ultimately still obeys the duration budget in §8: one more element usually means several more bars, and exceeding 3–5 minutes requires a reason.
5.2 Adding kime
Any structure can have a roughly 2-bar kime added at the end of a section or inside the chorus. ★ When you feel the song "lacks ups and downs (merihari)", consider this first, rather than adding sections.
This is one of the two prescriptions for dealing with "lack of ups and downs"; the other is the phrase-group repetition expansion in §5.1. Both are lighter than adding a new section, so they are placed first to try. How the kime itself is arranged (unison, leaving space, or adding fills) is strongly related to position and style, and belongs to the arrangement execution layer, so it is not laid out in this section on form.
6. When pop terminology is not enough: classical formal devices
When doing film/TV scoring, instrumental music, or when finer structural analysis is needed, the pop set of "A/B/sabi" is not enough. The Chinese/Russian system provides finer gradations:
| Device | Use |
|---|---|
| Period | A stricter unit than "section". Divided intoone phrase、two phrases、three or more phrasesstructure |
| Double period | A larger unit made of two periods |
| Open period | A period ending on a non-tonic chord—★ corresponds to mc-melody reference §5'scadential openness levels 5–8 |
| Introduction and extension before and after the period | Additional parts outside the structure. ★ Explains "why this passage is 17 bars and not 16" |
| Simple binary form | Two types: with recapitulation / without recapitulation |
| Simple ternary, compound ternary, rondo, variation, sonata | See reference.md §3 |
★ A period as an independent form and a period as part of a form have different characteristics—— This distinction is very useful for judging "is this a passage or a piece".
Usage in this library: when writing pop songs, use the terminology of §1–§5; when going
mc-style-cinematicor when structural analysis is needed (mc-case-studies), switch to this set. Do not mix the two sets, otherwise handoffs will get messy.
6.1 ★ What the passage is doing: five modes of statement and six structural functions (Li Jiti)
§1 to §5 use the passage'sname, while this set uses the passage'sbehavior, filling the gap between name and function (Li Jiti, Form and Work Analysis, p0022–0024).
| Mode of statement | Characteristics | In one sentence |
|---|---|---|
| Expository | Stable tonality, unified material, complete syntax | Put the thing out there |
| Developmental | Both statement and harmonic tonality are unstable and increasingly turbulent, the structure fragments, modulations are frequent, and there is no complete syntax | Take the thing apart |
| Transitional | Connecting what comes before and after: first supplementing the previous musical idea → modulating → leading to a new musical idea, or stopping on anexpectant chordon | Build a bridge |
| Closing | Fragmented melody, stable tonality, emphasis on cadences or a tonic pedal | Only answers, does not ask |
| Introductory | Hints at the later tonality, tempo, texture, and melodic outline | Only asks, does not answer |
Six structural functions: introduction (introductory; there is also the "conclusion-type introduction", as in "The Internationale"), beginning (expository), middle (★ even if a new theme is introduced with an expository statement, the function is still contrast), connection (transitional; in large works it also serves to "first develop what was left unsaid earlier"), recapitulation (restores the expository character, but the purpose becomes emphasizing the main musical idea and restoring balance; when developmental elements seep in, it isdevelopmental recapitulation), coda (concluding; in large works, a supplementary re-development may be done at the start of the coda).
Usage: For each section in the spec sheet, write down which type of statement it is. If the chorus is written as developmental and the bridge as expository, that is a misplaced section function, and changing the name will not save it.
6.2 The five forms of the recapitulation section (Li Jiti p0066, p0070)
| Form | Approach |
|---|---|
| Complete (static) recapitulation | As is |
| Varied recapitulation | Change the texture or orchestration, leave the material unchanged |
| Developmental recapitulation | Motivic reworking, unstable rhythm, harmonic intervention, thickened texture, increased dynamics, often leading to structural expansion and even becoming the overall climax of the piece |
| Composite recapitulation | Simultaneously recapitulate material from the middle section or the introduction |
| Abridged recapitulation | Recapitulate only a portion |
The answer to "how the final chorus changes" is in this table; on the lyrics side, the common practice of changing one to three characters and adding a closing line in the final pass is the same thing done in the lyrics (for the alignment of corpus numbers with the music side, see mc-development §7.4).
★ The recapitulation need not be in the tonic: Bach's recapitulations are often in the dominant or subdominant; as long as the sections correspond to those of the exposition, it is called a recapitulation (Zhao Xiaosheng p0232).
6.3 How musical ideas develop, how form is combined (Li Jiti)
How musical ideas develop (the three paths of processing, extension, and contrast, and their correspondence with the ten techniques) belongs to mc-development §5.1; how form is combined remains in this skill §2 and reference §4.
7. Correspondence with ARR-SPEC fields
| Field | This skill |
|---|---|
form[].id |
The terminology system of §1 (I/A1/B1/C1/D/O) |
form[].name |
★ Use English terminology(Intro/Verse/Pre-Chorus/Chorus/Bridge/Instrumental/Outro), because it maps directly to the backend's section labels.Japanese terminology is used only in notes and communication |
form[].bars |
The templates in §2 give default values;breaking the defaults belongs to mc-arrangement-arch |
form[].start_bar |
End-to-start connection (lint #2) |
| Number of sections | The 2–3 sections of §2.2 |
★ A mapping trap：Oosabi should be mapped to Bridge, not Chorus。
If mapped incorrectly, the backend will give you a high-energy chorus at that position, when it should be introspective.
8. Must-pass after writing
- The terminology used isthe English-American setFill in
form[].name, Japanese terminology only in annotations - Oosabi is mapped to Bridge, not Chorus
- The whole piece has 2–3 sections, duration 3–5 minutes (or you can explain why not)
- Usedthe omission-repetition rule(Section 2 omits the repeated opening)
- Adjacent passages aredifferent in at least two of the six comparison items
- Itis designed by working backward from the chorus, not arranged from the beginning forward
- Before adding a passage,first try phrase repetition
- The chorus'ssecond half also has a climax, not just an impact at the beginning
- If using ternary form,B's character is a dramatic change
Appendix: Sources
- "The Book for Understanding Professional Songwriting" + Hiroshi Takayama, "Melody Writing for Popular Music Composition, Expanded Edition"—§1–§5 main body.
Parts that have been moved out: specific techniques of passage contrast → reference.md;
hook design and climax/ending →
mc-arrangement-arch§7, §8; anti-predetermined-harmony checklist →mc-melody§8。 - Wu Zuqiang, "Musical Form and Work Analysis"—§6 main body of classical formal devices.
- Leonard/On Musical Form、 Central Conservatory of Music Musical Form Example Collection—source of score examples.
- Li Jiti, "Musical Form and Work Analysis"(Central Conservatory of Music Distance Education Series, sixteen lectures;)—— The organizational logic of traditional Chinese music is fundamentally different from the Western "principle of recapitulation"; for an outline see reference.md §5。