The correct answer to this open question is the following.
What can popular culture tell us about a historical period is the way people lived and thought during that particular period in history. Often, artists -in this case, musicians- write music about the things that are happening daily in society. Music describes moods, feelings, and relate stories of each epoch. Trends in music, film, and television are important for understanding an era because as ion the case of music, they reflect the things, customs, traditions, tendencies, and the life of people in any period. Artistic expression is the result of the life of people in different moments. For instance, the counter-culture of the 1960s and 1970s, that represented a culture change in youth and American society.
Popular culture can tell us about a historical period by showing the lifestyle of people of a particular era with their surroundings, architecture, clothes, etc.
Popular culture tends to form a new culture developed around the world, which dominates society.
Popular culture changes from time to time with its lifestyle as we have moved towards a modernized world.
Trends in music, film and television are important because they reflect the ideas and style of that particular period.
For example, dance, music, movies and fashion were different in 1920 than we have today.
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