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Composer Toydora delves into the functions of chords, namely tonic (T), dominant (D), and subdominant (S). As a result, he concludes that perhaps there are no chord functions at all.
Questions and opinions are welcome in the comments.
☆☆☆Correction☆☆☆
From 2:47, the VII chord in C minor key is "B♭7"! "B7" is incorrect, so I correct it.
At 4:50, I mentioned that "In classical music, the function of III is not defined," but this explanation is somewhat inaccurate. According to Jo Shimaoka (1998) in "Comprehensive Harmony: Practical Techniques, Analysis, and Principles (総合和声 実技・分析・原理)," while the early practical and analytical sections do not define the function of III chords, it is mentioned in the later theoretical section as being either D or T. Since it is mentioned, we cannot definitively say that it is not defined. However, since it is ultimately assigned an ambiguous function, we cannot definitively say that it is defined.
0:00 What are "T・D・S"?
2:45 Diatonic chord functions
9:40 Various interpretations of chord functions
10:24 Examples of chords with ambiguous functions
18:33 The baseless nature of "T・D・S"
21:31 Toidora's definition of "T・D・S"
23:16 Chord functions, the gradient theory
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Composer Toydora → tomita-haruki.studio.site/
#MusicTheory