原创图解 03 · 和声
ORIGINAL DIAGRAM 03 · HARMONY
同一个和弦，谁在最下面？
Same chord. Which note is lowest?
先预测：把D移到上方，和弦还叫D吗？切换配置，比较不变的根音与改变的低音。
Predict: if D moves above the others, is this still a D chord? Switch voicings to compare the fixed root with the changing bass.
音高位置图
Pitch-position diagram
越上面越高；每条细线相差1半音。横向仅分隔标签，不表示时间、手或五线谱。带框的点是最低音。
Higher means higher pitch; adjacent thin lines are 1 semitone apart. Horizontal spacing only separates labels: it is not time, hands or staff notation. The boxed point is the bass.
根音：D，决定和弦的名称。最低音：实际发声中最低的那个音。转位：看最低音是根音、三音还是五音。
Root: D names the chord. Bass: the actual lowest sounding pitch. Inversion: check whether the bass is the root, third or fifth.
同一组音名是D、F#、A。F#比D高4半音，A比D高7半音；这些关系构成D大三和弦。换八度不改变这三个音级的身份。
The note names are D, F# and A. F# is 4 semitones above D; A is 7 above D. These relationships form a D-major triad. Octave displacement preserves these pitch-class identities.
不用互动也能核对
Answers without interaction
| 配置Voicing | 音列（从低到高）Pitches, low to high | 低音／转位Bass / inversion |
|---|---|---|
| 原位 · 紧凑Root · compact | D3 · F#3 · A3 | D3／原位D3 / root position |
| 第一转位First inversion | F#3 · A3 · D4 | F#3／第一转位F#3 / first inversion |
| 第二转位Second inversion | A2 · D3 · F#3 | A2／第二转位A2 / second inversion |
| 原位 · 展开Root · spread | D3 · A3 · F#4 | D3／原位D3 / root position |
边界：这里只改变D大三和弦的音域与排列，不判定功能、音量或哪种更好听；不指定手型，也不发声。实际乐曲仍需要上下文。
Limits: only register and arrangement of a D-major triad change. This does not judge function, loudness or preference, prescribe a hand shape or produce sound. Actual music needs context.