审阅范围 · Review scope
限定范围独立审阅。请保留正文中的出处与限制；不代表全库最终验收、实际演奏或学习效果验证。
Independent review within the stated scope. Keep the evidence and limitations stated in the text in view. This is not final corpus acceptance or validation of performance or learning outcomes.
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This page preserves the author’s frozen review bytes, so prose or data may still contain candidate, pending-review or unpublished labels. This version has passed bounded independent review and repository publication; those labels record author-time status only. Acceptance covers bilingual meaning, bounded source text/stills and original fixed-fixture checks, not source audition, continuous motion, full source scores, actual performance, physical suitability or learning outcomes.
拿坡里和弦：先拼降二级，再找低音
先把三个问题分开
在D小调中，E♭–G–B♭是什么和弦？若最低音换成G，根音也变成G吗？如果后面接A大三和弦，这个连接又怎样解释？本课依次核对拼写、低音与上下文，再用四小节原创材料练习。先在纸上回答，不要求听出和弦名称。
前置是字母音名、升降号、三和弦与四分音符。C4为中央C，音名后的数字表示八度，不是指法。表格用Eb、Bb、C#等ASCII写法，分别与E♭、B♭、C♯同义；b不是音名B。
先遮住后面的答案：写出D自然小调的第二级音，把它降低半音，再以所得音为根音写大三和弦。随后另写一个问题：若最低音是G，需要怎样标转位？暂时把“是什么和弦”与“用来做什么”分栏。
降的是第二级根音，不是三个音一起降
本课明确以D小调为语境；D自然小调写作D–E–F–G–A–B♭–C。第二级是E，降低半音得到E♭，以它为根音的大三和弦是E♭–G–B♭。相对E♭的半音距离是0、4、7；字母E–G–B保留根音、三音、五音的关系。
这里用♭II表示“降二级上的大三和弦”：♭说明根音相对第二级降低，罗马数字大写说明大三和弦性质。D自然小调原有的二级三和弦是E–G–B♭，即减三和弦ii°；只把根音E改成E♭，上方G和B♭不动，才得到本例的♭II。B♭本来就在这个自然小调音阶里。
若写E♭–G♭–B♭，得到的是E♭小三和弦，不符合此处的大三和弦配方。若写D♯–G–B♭，在十二平均律键盘上虽可落在同样的三个键，却没有保留本例的降二级根音拼写与三度堆叠字母。核对琴键相同不能代替核对音名。
“拿坡里和弦”（Neapolitan chord）在本课指调性语境中的这个♭II大三和弦；常见的第一转位称为拿坡里六和弦（Neapolitan sixth），写N6或♭II6。先核结构，再判断它是否在具体乐句中担当属和弦之前的准备角色；单独一个E♭和弦不能确定全曲调性或功能。
| ID | 音名 | 根音半音距离 | 核对 |
|---|---|---|---|
| N | Eb–G–Bb | 0,4,7 | 符合本例♭II大三和弦。 |
| ii-dim | E–G–Bb | 0,3,6 | D自然小调的ii°，不是降二级根音。 |
| minor | Eb–Gb–Bb | 0,3,7 | E♭小三和弦；三音错误地降低。 |
| respelling | D#–G–Bb | 0,4,7 | 琴键相同，但没有保留本例降二级与三度堆叠拼写。 |
转位由实际最低音决定
下方四组配置是互相独立、没有节奏的分析对象。A与B的低音都是E♭3，所以即使上方次序和音区不同，它们仍是原位。C的低音G3是E♭和弦的三音，故是第一转位E♭/G；D的低音B♭2是五音，故是第二转位E♭/B♭。四组根音都仍是E♭。
在C配置G3–B♭3–E♭4中，从实际低音G3向上数，B♭3是小三度、E♭4是小六度。6是传统三和弦转位数字6/3的简写，不是“再添一个六度音”，也不是六个音。斜线后的G指定最低音，不把和弦改名为G大三和弦。
四小节例子的第二小节把低音再放低为G2，同时保留G3、B♭3、E♭4；它仍是第一转位。此时相对G2实际写出的音程是八度、十度、十三度，折回单音程后是同音类、三度、六度。加倍G或扩大音区不会自动改变转位；这些配置也不是要求一只手抓住的手型。
| ID | 从低到高 | 根音 | 低音 | 转位0/1/2 | 代号 | 数字 |
|---|---|---|---|---|---|---|
| A | Eb3–G3–Bb3 | Eb | Eb3 | 0 | Eb | 5/3 |
| B | Eb3–Bb3–G4 | Eb | Eb3 | 0 | Eb | 5/3 |
| C | G3–Bb3–Eb4 | Eb | G3 | 1 | Eb/G | 6/3 |
| D | Bb2–Eb3–G3 | Eb | Bb2 | 2 | Eb/Bb | 6/4 |
一个给定的D小调连接
本库原创的和声计划是Dm—E♭/G—A—Dm，在给定的D小调语境中标i—N6—V—i。第二和弦在这里放在属和弦A之前，可作前属（predominant）的分析；这是对这条计划的解释，不是见到任意♭II就必须套用的功能规则。实际作品还要查看旋律、低音、前后和声与风格。
A和弦写作A–C♯–E，C♯不是D自然小调中的C，而是本例属和弦所用的升高第七级。不要为了让所有音都属于自然小调而把它改成C，也不要因此把整句改判为D大调：首尾Dm仍明确含F自然音。调性语境不等于全句只能使用一套不变的七音。
沿V4上声部追踪的是D4—E♭4—C♯4—D4。E♭4到C♯4在十二平均律中下降2个半音，但字母E–D–C构成三度，所以写作下行减三度；不是按字母相邻的级进。最后C♯4到D4上行1个半音。这里只核音名、音程与连接，不据此保证平滑听感，也不把它当作所有风格的四部写作范本。
反过来，在明确的E♭大调语境中，E♭–G–B♭可作主和弦I；相同音集合不能单独证明“这是D小调的前属”。同样，某个来源建议考虑用拿坡里和弦替换二级或四级，不能免除对既有旋律和全部声部的核对。本课不要求把熟悉曲子的每个ii或iv都替换。
| 小节 | 代号 | 根音顺序拼写 | 低音 | 此语境分析 | 全局q |
|---|---|---|---|---|---|
| 1 | Dm | D–F–A | D3 | i | [0,4) |
| 2 | Eb/G | Eb–G–Bb | G2 | N6 | [4,8) |
| 3 | A | A–C#–E | A2 | V | [8,12) |
| 4 | Dm | D–F–A | D3 | i | [12,15) |
四小节时间表与练习路线
全句为4/4，以四分音符为单位q：每小节4q，共16q。全局时间从0开始，[a,b)包含a、不包含b。第一至三小节每个声部各有一个4q音；第四小节每个声部各有一个3q音，随后在[15,16)全体休止1q。没有延音线、踏板或反复；相邻小节同音也重新起音。
下表给出四条完整声部时间线，是纸面和声模型，不是已录制的演奏。音符终点只代表规定的时值边界，不代表测得的放键或声音消失时刻。第三小节V3的A3在第四小节仍需重新起音；第四小节第4拍保留休止，不能在q=15提前开始下一遍。
全模型共有16个音符事件和4个声部休止事件；四个休止同时发生，只构成一个全体休止窗口。四条声部的音与休止时值相加为64q，但并发全句只经过16q。下方键号表以A0=第1键、C4=第40键；MIDI号只是核算标签，不需要MIDI设备。
纸笔路线：不看答案写出第二小节的根音、实际最低音、全部音名和转位，再核对配方表。把四条时间线逐格画到16格纸上，标出q=15的休止。若把根音写成G，重查根音与低音两栏；若写成E♭小三和弦，重查G与G♭，暂不把它归因为手指或听觉问题。
钢琴是可选路线：先单独找V4的D4、E♭4、C♯4，再按表走完整D4—E♭4—C♯4—D4及最后休止。一次只按一个音，按规定边界放开，再起下音；无需同时抓和弦。也可只说音名并指纸格。另一次可单独核V1低音D3—G2—A2—D3；只弹上声部或低音都没有实现完整四声部和声。
若第二到第三小节难以读清，可先取全局[4,12)作局部：局部原点为q=4，V4是E♭4[0,4)、C♯4[4,8)，共8q。核对后连回第一至三小节，再从第一小节走完四小节和末尾休止。只完成两音局部不能记成整句完成；局部练习也不改变原来的小节号。
速度只作算术示例：四分音符60 BPM时，全句16秒、局部8秒、末尾休止1秒；48 BPM时分别为20、10、1.25秒。选择能清楚找音、数拍与保留休止的速度；这些数字不是必须达到的目标，也不是经验证的练习剂量。
记录路线、是否看答案、根音与低音答案、拼写、末尾休止、整句结果及下次核对时间；没有观察到的写“未知”。下一次先不看答案重做这份熟悉材料，记下实际间隔，然后再练习。它是延后保留检查，不是未见材料迁移测验；本页没有真实演奏或学习效果数据。
| 声部 | 第1小节 [0,4) | 第2小节 [4,8) | 第3小节 [8,12) | 第4小节 [12,15) | 第4小节 [15,16) |
|---|---|---|---|---|---|
| V1 | D3 | G2 | A2 | D3 | 休止 |
| V2 | F3 | G3 | E3 | F3 | 休止 |
| V3 | A3 | Bb3 | A3 | A3 | 休止 |
| V4 | D4 | Eb4 | C#4 | D4 | 休止 |
| 音名 | MIDI | 88键号 |
|---|---|---|
| G2 | 43 | 23 |
| A2 | 45 | 25 |
| Bb2 | 46 | 26 |
| D3 | 50 | 30 |
| Eb3 | 51 | 31 |
| E3 | 52 | 32 |
| F3 | 53 | 33 |
| G3 | 55 | 35 |
| A3 | 57 | 37 |
| Bb3 | 58 | 38 |
| C#4 | 61 | 41 |
| D4 | 62 | 42 |
| Eb4 | 63 | 43 |
| G4 | 67 | 47 |
来源与原创推导的边界
NC-037既有ASR的82段已全部阅读；63、81、125、181、205秒共5张静帧已检查。63秒可见C大调与D♭标签，81秒可见C♯小调与D标签；125秒有D♭、D♭/F、D♭/A♭及指向中间项的“最常用”标注；181秒有C—D♭/F—G7(omit5)—C标签行；205秒有标D/F♯的红框。这里只确认这些可见文字、标签和布局，不逐音验收源谱，也不凭红框确认作品身份。
未经听校的ASR提出“降二级大三和弦”的构造、把它考虑为二级或四级的替代，以及第一转位常用；这些来源解释仍是候选归因。静帧上写“最常用”只证明画面有该文字，不证明跨曲目统计。来源历史说明、特定作品分析和“奇怪感觉”等听感判断未在本课核实或移植为通则。
未听原声、未连续观看动作、未逐音审核完整源谱，也未验证ASR与选帧精确对齐。清单时长278.358秒，容器时长278.336秒，差0.022秒尚未解释；两者均不表示实际听看时长。没有新ASR、身体适用性或演奏验收。
D小调配方、四组独立配置、四小节声部与休止、局部窗口、反例和记录单均为本库原创。公开文件不含源图、原始音视频、完整转写或私有路径。ASR文字加选定静帧只构成有限模态覆盖，不等于完整视听审阅；当前文件为待独立审阅的作者候选。
Neapolitan chords: spell lowered degree 2, then find the bass
Separate three questions
In D minor, what chord is E♭–G–B♭? If G becomes the lowest note, does G also become the root? How might the connection be understood if an A major triad follows? This lesson checks spelling, bass and context in that order, then practices them with four original bars. Answer on paper first; identifying chords by ear is not required.
Prerequisites are letter names, accidentals, triads and quarter notes. C4 is middle C; the number after a pitch is its octave, not a fingering. Tables use ASCII Eb, Bb and C# for E♭, B♭ and C♯ respectively; b is not the note name B.
Cover the answers below: write degree 2 of D natural minor, lower it by one semitone, and build a major triad on the result. Then answer a separate question: if G is lowest, how should the inversion be labeled? Keep “what chord is it?” and “what does it do here?” in separate columns.
Lower degree 2, not all three chord tones
D minor is explicitly stipulated as the context. D natural minor is D–E–F–G–A–B♭–C. Degree 2 is E; lowering it by one semitone gives E♭, whose major triad is E♭–G–B♭. Its semitone distances from E♭ are 0,4,7, while the letters E–G–B retain root, third and fifth relationships.
Here ♭II means a major triad on lowered degree 2: ♭ lowers the root relative to degree 2, and the uppercase numeral specifies major-triad quality. The native degree-2 triad of D natural minor is E–G–B♭, the diminished triad ii°. Changing only its root E to E♭, while retaining G and B♭, yields this example’s ♭II. B♭ is already in this natural-minor scale.
E♭–G♭–B♭ is an E♭ minor triad and does not meet the major-triad recipe here. D♯–G–B♭ can use the same three keys in twelve-tone equal temperament, but it does not preserve this example’s lowered-second root spelling or tertian letters. Equal keyboard positions do not replace a spelling check.
“Neapolitan chord” here refers to this major ♭II triad in a tonal context. Its common first-inversion form is called the Neapolitan sixth, written N6 or ♭II6. Check structure before deciding whether it serves a preparatory role before a dominant in a particular phrase; one E♭ chord alone cannot establish a piece’s key or function.
| ID | Pitches | Semitones from root | Check |
|---|---|---|---|
| N | Eb–G–Bb | 0,4,7 | Matches this example’s major ♭II triad. |
| ii-dim | E–G–Bb | 0,3,6 | ii° of D natural minor; the root is not lowered degree 2. |
| minor | Eb–Gb–Bb | 0,3,7 | E♭ minor; the third was incorrectly lowered for this task. |
| respelling | D#–G–Bb | 0,4,7 | Same keys, but does not preserve this task’s lowered-second and tertian spelling. |
Inversion follows the actual lowest note
The four voicings below are independent analytical objects without rhythm. A and B both have E♭3 in the bass, so they remain in root position despite different upper ordering and register. C has the chord’s third G3 in the bass, making it first-inversion E♭/G; D has the fifth B♭2 in the bass, making it second-inversion E♭/B♭. All four retain E♭ as root.
In voicing C, G3–B♭3–E♭4, B♭3 lies a minor third above the actual bass G3 and E♭4 a minor sixth above it. The 6 abbreviates the traditional triad-inversion figures 6/3; it does not mean “add another sixth” or “six notes.” G after the slash specifies the bass without renaming the chord G major.
Bar 2 of the four-bar example places the bass lower at G2 while retaining G3, B♭3 and E♭4; it is still first inversion. The written intervals above G2 are then an octave, tenth and thirteenth, reducing to unison class, third and sixth. Doubling G or widening the register does not automatically change inversion, and these voicings are not hand shapes that one hand must hold.
| ID | Low to high | Root | Bass | Inversion 0/1/2 | Symbol | Figures |
|---|---|---|---|---|---|---|
| A | Eb3–G3–Bb3 | Eb | Eb3 | 0 | Eb | 5/3 |
| B | Eb3–Bb3–G4 | Eb | Eb3 | 0 | Eb | 5/3 |
| C | G3–Bb3–Eb4 | Eb | G3 | 1 | Eb/G | 6/3 |
| D | Bb2–Eb3–G3 | Eb | Bb2 | 2 | Eb/Bb | 6/4 |
One stipulated D-minor connection
The original harmonic plan is Dm—E♭/G—A—Dm, labeled i—N6—V—i in the stipulated D-minor context. The second chord is placed before the dominant A here and can be analyzed as predominant. This interprets this plan; it is not a rule that every ♭II must receive that function. An actual work still requires its melody, bass, surrounding harmonies and style.
The A chord is A–C♯–E. C♯ replaces the natural-minor C as the raised seventh used by this example’s dominant. Do not change it to C merely to keep every note in natural minor, or relabel the whole phrase D major: the opening and closing Dm explicitly contain F natural. A tonal context does not require one unchanging seven-note collection throughout.
Voice V4 follows D4—E♭4—C♯4—D4. E♭4 to C♯4 descends two semitones in twelve-tone equal temperament, but the letters E–D–C span a third, so it is a descending diminished third, not adjacent-letter stepwise motion. C♯4 then rises one semitone to D4. These are spelling, interval and connection checks, without a guarantee of perceived smoothness or a model for four-part writing in every style.
Conversely, in an explicit E♭-major context, E♭–G–B♭ can be tonic I; the same collection alone cannot prove “D-minor predominant.” Likewise, a source suggestion to consider substituting a Neapolitan for a degree-2 or degree-4 chord does not remove the need to check the existing melody and all parts. This lesson does not ask you to replace every ii or iv in familiar music.
| Bar | Symbol | Root-order spelling | Bass | Analysis here | Global q |
|---|---|---|---|---|---|
| 1 | Dm | D–F–A | D3 | i | [0,4) |
| 2 | Eb/G | Eb–G–Bb | G2 | N6 | [4,8) |
| 3 | A | A–C#–E | A2 | V | [8,12) |
| 4 | Dm | D–F–A | D3 | i | [12,15) |
Four-bar timeline and practice routes
The phrase is in 4/4 with quarter-note unit q: 4q per bar and 16q overall. Global time starts at 0; [a,b) includes a but excludes b. Each voice has one 4q note in bars 1–3 and one 3q note followed by a 1q all-voice rest at [15,16) in bar 4. There are no ties, pedal or repeats; repeated pitches across a barline rearticulate.
The table supplies four complete voice timelines as a paper harmony model, not a recorded performance. Note endpoints represent stipulated duration boundaries, not measured key releases or sound cessation. V3’s A3 rearticulates in bar 4 despite being the same pitch as bar 3; keep the final fourth-beat rest rather than starting another pass early at q=15.
The full model contains 16 note events and four voice-rest events. The four rests coincide, forming one all-voice rest window. Summing note and rest durations across the four voices gives 64q, but the concurrent phrase lasts only 16q. In the key table, A0 is key 1 and C4 key 40; MIDI numbers are calculation labels and require no MIDI device.
Paper route: without looking at the answers, write bar 2’s root, actual lowest note, full pitches and inversion, then check the recipe table. Draw each voice on a sixteen-slot timeline and mark the rest at q=15. If you wrote G as root, revisit the root and bass columns; if you wrote E♭ minor, revisit G versus G♭ without diagnosing a fingering or hearing problem.
Piano is optional: first locate V4’s D4, E♭4 and C♯4 separately, then follow the full D4—E♭4—C♯4—D4 line and final rest. Play one note at a time, intending to release at the stipulated boundary and start the next note; no simultaneous chord grip is required. Saying names while pointing to paper slots also works. On a separate pass, check V1’s bass D3—G2—A2—D3 alone; neither upper voice nor bass alone realizes the full four-voice harmony.
If bars 2–3 are hard to read, isolate global [4,12): with local origin q=4, V4 is E♭4[0,4), C♯4[4,8), totaling 8q. After checking, reconnect bars 1–3, then complete all four bars and the final rest from bar 1. Completing the two-note fragment is not completion of the phrase, and the local exercise does not change the original bar numbers.
Tempo is only an arithmetic illustration: at quarter note=60 BPM, the phrase is 16 seconds, the fragment 8 seconds and the final rest 1 second; at 48 BPM these are 20,10 and 1.25 seconds. Choose a tempo that permits finding notes, counting and preserving the rest; these figures are neither required targets nor validated practice doses.
Record the route, answer visibility, root and bass answers, spelling, final rest, whole-phrase result and next check time; mark unobserved items “unknown.” Next time, attempt this familiar material without answers before practicing and record the actual interval. This is a delayed retention check, not an unseen-material transfer test; this page contains no real performance or learning-effect data.
| Voice | Bar 1 [0,4) | Bar 2 [4,8) | Bar 3 [8,12) | Bar 4 [12,15) | Bar 4 [15,16) |
|---|---|---|---|---|---|
| V1 | D3 | G2 | A2 | D3 | Rest |
| V2 | F3 | G3 | E3 | F3 | Rest |
| V3 | A3 | Bb3 | A3 | A3 | Rest |
| V4 | D4 | Eb4 | C#4 | D4 | Rest |
| Pitch | MIDI | 88-key number |
|---|---|---|
| G2 | 43 | 23 |
| A2 | 45 | 25 |
| Bb2 | 46 | 26 |
| D3 | 50 | 30 |
| Eb3 | 51 | 31 |
| E3 | 52 | 32 |
| F3 | 53 | 33 |
| G3 | 55 | 35 |
| A3 | 57 | 37 |
| Bb3 | 58 | 38 |
| C#4 | 61 | 41 |
| D4 | 62 | 42 |
| Eb4 | 63 | 43 |
| G4 | 67 | 47 |
Source boundaries and original derivation
All 82 existing NC-037 ASR segments were read; five stills at 63,81,125,181 and 205 seconds were inspected. The 63-second still shows C-major and D♭ labels; 81 shows C♯-minor and D labels. At 125, D♭, D♭/F and D♭/A♭ appear with a “most common” annotation pointing to the middle item. At 181 there is a C—D♭/F—G7(omit5)—C label row; at 205 a red box is labeled D/F♯. These observations establish visible text, labels and layout only, without a note-by-note source-score audit or work identification from the red box.
The unaudited ASR proposes construction as a major triad on lowered degree 2, consideration as a substitute for degree-2 or degree-4 chords, and common use of first inversion. These source explanations remain candidate attributions. A visible “most common” annotation proves that text appears, not a statistic across repertoire. The source’s history, particular-work analysis and judgments about a “strange feeling” were not verified here or adopted as general rules.
Source audio was not auditioned, continuous motion was not watched, the complete source score was not audited note by note, and precise ASR/still alignment was not verified. Inventory duration is 278.358 seconds and container duration 278.336 seconds, leaving an unexplained 0.022-second difference; neither represents actual listening/viewing time. There was no new ASR, physical-suitability validation or performance acceptance.
The D-minor recipes, four independent voicings, four-bar voices and rests, fragment window, counterexamples and record are original to this repository. Public files contain no source images, original media, complete transcript or private paths. ASR text plus selected stills constitutes limited modality coverage, not full audiovisual review; these files are author candidates pending independent review.
Related: intervals and spelling, chord identity and voicing, figures from the bass, rhythm, source scope.