What Frère Jacques has to do with Mahler's first symphony is that Frère Jacques' song was infused in the third movement of Gustav Mahler's first symphony.
Not only that, Gustav Mahler intended to change the symphony from minor key to major key as his first symphony was a funeral march.
Thus, Frere Jacques's song contains the major key, while the rest of the symphony has a minor key.
Gustav Mahler's first symphony has four-movement structures.
Hence, in this case, it is concluded that Frère Jacques' song was infused in the third movement of Gustav Mahler's first symphony.
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The correct answer to this open question is the following.
Your question is a little bit confusing. If what you need is a form of art or artistic expression that represents one of the activities people are doing during the Pandemic, and is exhibited in a public place, then we can comment on the following.
There is a 5-story building in downtown, next to the main square, that has a big mural in which one can see how medical doctors are helping people in need.
I have seen in the news that there are cities that have asked artists to create modern sculptures to honor medical doctors that have contributed to control the pandemic. In other cases, memorials have been constructed to honor the people who have died.
