Four changes in 11th century that would give Western music many of its basic characteristics:
1. Written composition slowly replaced improvisation as a way of creating musical works 2. The invention of precise musical notation made it possible to write music in a definitive form. Result: composition and performance became separate acts. 3. Music began to be more structured and made subject to principles of order: theory of eight modes, rules for consonance and rhythm.
Dissonance – notes creating tension that required resolution Consonance – notes that create repose or resolve tension • Perfect and Imperfect consonances Perfect: unison, 4th, 5th, and 8va Imperfect: 3rd and 6th
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