Modern dancing classes explained...

Modern dance is a dance form developed in the early 20th century. Although the term Modern dance has also been applied to a category of 20th Century ballroom dances, Modern dance as a term usually refers to 20th century concert dance.

Both Postmodern dance and Contemporary dance are built upon the foundations laid by Modern dance and form part of the greater category of 20th century concert dance. Where as Postmodern dance was a direct and opposite response to Modern dance, Contemporary dance draws on both modern and postmodern dance as a source of inspiration.

Explanation supplied courtesy of http://en.wikipedia.org/