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JOE'S GARAGE: THE EMOTIONAL DIMENSION
The unlimited popularity of the tonal system in western music has a lot to do with its capacity, combined with instrumentation and the way music is performed, to translate emotions into music in a for everybody recognizable form.
It's also the way most people like to talk about music, often giving highly subjective interpretations of what the music means in their opinion along with it.
Joes garage full album frank zappa biography
Sections of music can express feelings of joy, sadness, anger and relaxation. Why this effect exists is usually not very clear. Dissonants and shouting can be associated with anger or tension, but why some melodic lines have the effect of joy and others don't is hardly explainable.
It's better to take it for granted that the three downwards played notes of a minor third have the effect of sadness, and composers looking to maximize recognizable emotional impact probably have a good catalogue in their mind of melody types and their effect (compare "Debra Kadabra"