De harmonia refers to the theoretical framework of harmony that developed during the Renaissance, emphasizing the relationships between musical notes and how they create chords and progressions. This concept marked a significant shift from the modal practices of the Medieval period, allowing for greater exploration of tonal structures and creating more complex musical textures. It also played a role in the emergence of new notational systems and educational methods that supported the understanding of music theory and its application in both sacred and secular contexts.
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