Who choreographs square dances?

Generally it is the teacher of each community dance troupe [aerobics, etc.]

Also there are teachers of urban dance troupes, etc.

Like the year before last, the sea fan dance is very popular in the Shanghai area. It was first choreographed by a dance teacher from the Pudong New Area Society in the Shanghai area.

Then it was taught to teachers in other communities. One by one, ten by ten.