Because it is a rectangle the same number of people have to be in each row of the marching band. 64 has factors of 1 and 64, 2 and 32, 4 and 16, and 8 and 8.
4 x 16 is the most appealing because having four band members per row and 16 rows. 8 people across and higher (16, 32, and 64) is too big to fit on a street, 2 and 1 across will just look weird. So the answer is 4 x 16
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