Diego Rodríguez de Silva y Velázquez was a Spanish painter, the leading artist in the court of King Philip IV, and one of the most important painters of the Spanish Golden Age.
The answer is D) rhythm.
During the Ars Antiqua, music theory made great strides. One of the most important innovations from this time was the devlopment of a notation, or written representation in sheet music, of rhythm. Rhythm is naturally a very important element of music, and being able to represent the rhythm of a song in written form made it much easier to play it accurately without having heard it.
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The author is nervous about snorkeling
In prehistoric times many songs were preformed as rituals for rain or fertility; however, in modern day many songs are the artists reliving memories or learning from experiences.