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Symmetric
Diatonicchords
Tritonesubstitution
hitoshikawai.com
C△
Gb△
G7
Fø
F△
Db7 Bø
Cb△
Bbm
Bb7
Ebm
Abm
Dm
Em
E7
Am
C
Gb 
シンメトリック ダイアトニックコード
サークルオブフィフスには2つの対称となる
ダイアトニックコードがある
C△
Gb△
G7
Fø
F△
Db7 Bø
Cb△
Bbm
Bb7
Ebm
Abm
Dm
Em
E7
Am
←Cに対する4
←Cに対する7
Gbに対する7→
Gbに対する4→
F ­ Bø に⾏かず、F ­ Fø  と弾いてみると、意外に
スムースに聴こえる
F = F A C E
Fø = F Ab B Eb
Bø = B D F A  
FøとBøはトライトーンを共有し、すり替えやすい
C△
Gb△
G7Fø
Db7 Bø
Bbm
Bb7
Ebm
Abm
Dm
Em
E7
Am4を対称のキーの7とみなすと
境界線がなくなる
4度進⾏(EADGCサイクル)で円を⼀周
ダイアトニックコードは対称となる2つの
キーをセットで覚えるとよい
1△
b5△
5 74 ø
b2 7 7 ø
b7 m
b7 7
b3 m
b6 m
2 m
 3 m
3 7
6 m
4度進⾏で1周
トライトーンサブスティテューション
ハーフディミニッシュドと同じく
トライトーンを含むドミナント
G7 Db7
E7 Bb7
C△
Gb△
G7
Fø
F△
Db7
Bø
Cb△
Bb7
Bbm
Ebm
Abm
Dm
Em
E7
Am
Db7にすり替え
G7にすり替え
C△
Gb△
Gø
G7
Fø
F△
Db7
Bø
Cb△
E7
Ebm
Abm
Dm
Bb7
Am
E7にすり替え
Bb7にすり替え
Dm ­ Db7 ­ C  G7をDb7で代⽤
Abm ­ G7 ­ Gb  DbをG7
Bm7b5 ­ Bb7 ­ Am  E7をBb7
Fm7b5 ­ E7 ­ Ebm  Bb7をE7
4度でなく半⾳進⾏になる
このコンセプトを拡張し、対称の他のコ
ードでも代⽤したり、ミックスする
半⾳進⾏、対称のキーの2-5が挿⼊さ
れる
ex. Em­Am­Dm­G7に対し
Em­Ebm­Dm­Db7
Em­Am­Abm­G7
Em­Am­Abm­Db7
など他にも⾊々なやり⽅が可能となる
C△
Gb△
Gø
G7
Fø
F△
Db7
Bø
Cb△
Bb7
Bbm
Ebm
Abm
Dm
Em
E7
Am
半⾳進⾏
半⾳進⾏
C△
Gb△
Gø
G7
Fø
F△
Db7
Bø
Cb△
Bb7
Bbm
Ebm
Abm
Dm
Em
E7
Am
4度(2-5)進⾏の挿⼊
4度(2-5)進⾏の挿⼊
Abm
Dm
EADGCサイクルの応⽤
4度進⾏で円を⼀周できたら
サイクルに代理を加えて弾く
スムースに聴かせる秘訣はヴォイシ
ングの選択にある
トライトーンサブスティテューションをス
ムースにするヴォイシングはドロップ2
A. ルートと2ndインヴァージョン
B. 1stと3rdインヴァージョン
2つのセットとする
ドミナント、ハーフディミニッシュドは
トライトーンを軸に他の2⾳が動く
メジャー、マイナーは全⾳が隣のフレット
に互い違いに移動する
開いたり閉じたりするイメージ
ex. トライトーンサブスティテューション
ドミナントの動き
2ndインヴァージョン
ルートポジション
1stと3rdインヴァージョン
ex. トライトーンサブスティテューション
ハーフディミニッシュドの動き
2ndインヴァージョン
ルートポジション
1stと3rdインヴァージョン
ex. トライトーンサブスティテューション
マイナーコードの動き
全⾳がトライトーンに移動する
それぞれ元のコードの半⾳隣りに位置する
→
→
→→→
→→→
ルートポジション
2ndインヴァージョン
ex. トライトーンサブスティテューション
マイナーコードの動き
3rd インヴァージョン
1st インヴァージョン
ex. トライトーンサブスティテューション
メジャーコードの動き
ルートポジション
2ndインヴァージョン
1stと3rdインヴァージョン
1st インヴァージョン
3rd インヴァージョン
トライトーンサブスティテューションは
ドロップ2でスムースなヴォイシングになる
ルートと 2ndインヴァージョン、1stと3rdイ
ンヴァージョンをセットにする
2⾳または4⾳が半⾳だけの動きとなる
開く、閉じる感覚でフォームを覚えるとよい
Symmetric
Diatonicchords
Tritonesubstitution
hitoshikawai.com

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シンメトリック ダイアトニックコードとトライトーン サブスティテューション(裏コード、代理コード)Symmetric diatonic chords and tritone substitution