Pyotr Ilyich Tchaikovsky · seção 23 de 36

Capítulo XXI. Propriedades enarmônicas do acorde de sétima diminuta

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§ 61. O acorde de sétima diminuta consiste em três terças menores superpostas. Nas inversões, obtemos, no lugar de terças menores, seus equivalentes enarmônicos: segundas aumentadas. Substituindo essas segundas pelas terças menores correspondentes, cada inversão assim modificada enarmonicamente produz um novo acorde de sétima diminuta.

Example 197 — Fig. 209 · Reproduzir este exemplo no leitor ▶

lá menor dó menor mi bemol menor sol bemol menor

Assim, todo acorde de sétima diminuta equivale a três outros. Conhecemos doze tonalidades ao todo; consequentemente, reconhecemos apenas três acordes de sétima diminuta distintos em som.

Example 198 — Fig. 210 · Reproduzir este exemplo no leitor ▶

Portanto, mudando enarmonicamente seus intervalos, todo acorde de sétima diminuta pode resolver em quatro tríades distintas.

Example 199 — Fig. 211 · Reproduzir este exemplo no leitor ▶

Example 200 — Fig. 212 · Reproduzir este exemplo no leitor ▶

Procuraremos agora usar essa peculiaridade do acorde de sétima diminuta para modular.

Example 201 — Fig. 213 · Reproduzir este exemplo no leitor ▶

Exercício. Façam-se modulações de diferentes tonalidades, usando em cada caso as quatro resoluções do acorde de sétima diminuta.

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