Set dances are based on quadrilles, which were court dances. These were transformed by the Irish into a unique folk dance of the Irish rural communities. When the Gaelic League was formed in 1897, it sought to discourage set dance, because it was perceived as being of foreign origins, and consequently at odds with the League's nationalist agenda. In its place, the League promoted ceili dance, a process which continued during the 1930s and 1940s with the support of the Catholic Church in the form of the Public Dance Halls Act 1935. The rise of rock and roll in the 1950s caused the popularity of set dancing to fade. However, in the 1980s a revival started and many sets that have not been done for forty years or more are being recovered and danced again.
The Set
To start, four couples are arranged in the form of a square to dance with each couple being in the middle of the sides of the square. Both the eight dancers in the group and the dance itself are called a "set". The dance is a sequence of several dance figures, which usually have a common theme or structure. The figures usually begin and end with repeated parts that everyone dances, and then during the figure each couple or pair of couples will dance separately. In the set, the couple with their backs to the band are traditionally named "First Tops" with "Second Tops" facing them. The couple on First Tops left hand side is called "First Sides" with "Second Sides" facing. Usually the First Tops are the first to dance, with some sets having First Sides and then Second Tops going next and some having Second Tops and then the First Sides. Second Sides is almost always the last couple to dance, and is therefore a good place for beginners to start, as they get more time to watch the demonstrations of the figure that the other couples give. Set dances from a particular region usually have similar elements. For instance, sets from the Connemara region have the First Sides on the right of the First Tops, and sets from the Clare region often involve footwork similar to Irish competitive Stepdance or traditional freeform Sean-nós dance. Distinctive set dances and dance regions emerged in the beginning of the 19th century and evolved as popular house dances separate from the more formal Irish step-dancing tradition. In some homesteads a kitchen pot was placed under the flag stones as an extra acoustical element for the house dance. Set dance differs from square dance and round dance in that it does not require a caller: the sequence of figures is predefined by the name of the set. In places with a large community of set dancers, like Ireland or New York City, it is usual for dances to be uncalled - that is, done with no calling - because most dancers already know the instructions for the common sets. However, at venues with larger numbers of occasional dancers, a caller is often present to give instructions as the dance progresses, for those people who are not yet familiar with the set.