Trojak ("threesome", "trio", in Polish) is a Silesian folk dance. It is a double partner dance and performed in groups of three: one male dancer and two female dancers. The music of the dance has two parts: a slow one in 3/4 metre and a fast one in 2/4 metre. These parts are repeated several times, one after another.
You can watch a video with the dance in Poland's gallery of the mobility in our country: