The art of the theater, especially the writing of plays.
Dramaturgy is 'the art or technique of dramatic composition and theatrical representation.' http://www.usq.edu.au/artsworx/schoolresources/fivewomen/dramaturgy.htm
Dramaturgy is the art of dramatic composition and the representation of the main elements of drama on the stage. http://www.google.com/search?hl=en&defl=en&q=define:dramaturgy&ei=3G5XSraaCcuWtged-_3dCg&sa=X&oi=glossary_definition&ct=title