Answer:
This is math not art lol.
A. commercial dance music, as it was considered rhythmically uninteresting, having a lack of variety in tempo and less complex structuring and being essentially a more mainstream sound.
Answer:
A musical periods are a certain type of recurrence in small-scale formal structure
Chronological dates are attributes to an object or event in the past, allowing such objects or events to be located in a previously established chronology.
Answer:
balance, rhythm and repetition, emphasis, proportion and scale, and last but not least, harmony
sorry i do not know the element but i hope tis helps you answering your question!