Hora, also known as horo and oro, is a type of circle dance originating in the Balkans but also found in other countries. The horah in klezmer music is the same as the traditional Romanian hora dance. It has a slow, limping gait in 3
8 and often leads into a faster and more upbeat freylekh or bulgar (wikipedia).
Harry Kandel (c. 1885–1943), born in Eastern Europe, was an American clarinetist and klezmer bandleader of the early twentieth century (wikipedia).