![File:Common-tone diminished seventh chord in Tchaikovsky's Nutcracker Suite, op. 71a, III, Valse des Fleurs.png - Wikimedia Commons File:Common-tone diminished seventh chord in Tchaikovsky's Nutcracker Suite, op. 71a, III, Valse des Fleurs.png - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/0/03/Common-tone_diminished_seventh_chord_in_Tchaikovsky%27s_Nutcracker_Suite%2C_op._71a%2C_III%2C_Valse_des_Fleurs.png/1200px-Common-tone_diminished_seventh_chord_in_Tchaikovsky%27s_Nutcracker_Suite%2C_op._71a%2C_III%2C_Valse_des_Fleurs.png)
File:Common-tone diminished seventh chord in Tchaikovsky's Nutcracker Suite, op. 71a, III, Valse des Fleurs.png - Wikimedia Commons
Chapter 15 The Smoothest Voice Leading: Common Tone-Stepwise and Contrary Motion-Nearest 15.1 Study a phrase of choral music
A Survey of Music Theory for the College Classroom: Chromatic Harmony 2 and 20th Century Music | OERTX
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