What does the speaker mean when he says that classical music is “a dialogue between the two powerful sides of our nature: instinct and intelligence”?

The speaker means that classical music is the embodiment of intelligent instincts , this is because classical music is considered a very formal style of music.

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"

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