Contemporary dance is a genre of dance performance that developed during the mid-twentieth century and has since grown to become one of the dominant genres for formally trained dancers throughout the world, with particularly strong popularity in the U.S. and Europe. Although originally informed by and borrowing from classical, modern, and jazz styles, it has come to incorporate elements from many styles of dance. According to the New Grove Musical Dictionary, contemporary dance evolved from the foundations of modern and postmodern dance, emphasizing innovation and a break from traditional forms. Due to its technical similarities, it is often perceived to be closely related to modern dance, ballet, and other classical concert dance styles. It is characterized by a blend of styles that often integrate elements of ballet, modern dance, and cultural or social dance forms.