Dance became a part of Philadelphia with the beginning of the Philadelphia Dancing Assemblies in 1748 which remained popular into the 20th Century. Major dancing organizations include the Pennsylvania Ballet founded in 1963. The Pennsylvania Ballet performs in the Academy of Music and the Merriam Theater. The Philadelphia Dance Company (Phildanco) was founded in 1970 and specializes in modern dance. The Koresh Dance Company was formed in 1991 and performs choreography that mixes elements of ballet, jazz, modern dance, and other dance forms.