Answer:
The harmonic interval that Renaissance composers cultivated for expressive purposes is the third harmonic, also known as the perfect fifth. Renaissance composers used the perfect fifth as a means of achieving harmonic consonance and stability. They often used it to reinforce the tonal center of a piece of music and to create a sense of balance and symmetry in their compositions. The perfect fifth was also used in the context of the Renaissance style of polyphonic music, in which multiple voices would sing or play different melodies simultaneously. In this style, the perfect fifth was used to create a rich and complex texture of harmonies and melodies.
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