Music that centers around one main note of the major or minor scale is called

Igotta why is there only 2 semesters and 4 quarters and not 4semesters and 4 quarters? 1 quarter for each semester? ? is this a dumb question?

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Awork of art that guides the viewer’s eyes through the use of shapes, lines, colors, or edges is an example of which principle of design? movement symmetry balance emphasis