What era in western classical music is generally associated with nonmetrical music?

answer; isometric perspective;

it's d, robert k merton. in 1994 he was awarded the national medal of science for his contributions to the field and for having founded the sociology of science.

because of the importance of consistency in data collection. but we have to evaluate the resource or information, and not just accept what is posted online since information available on the internet is not regulated for quality or accuracy.