List three major nonmusical changes that took place during the Contemporary
period.

contemporary classical music can be understood as belonging to the period that started in the mid- 1970s, which includes modernist, postmodern, neoromantic, and pluralist music. However the term may also be employed in a broader sense to refer to all post-1945 musical forms.

Explanation:

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it is c) 24hrs

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i'm not too sure - if you could attach the picture