music drama definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a form of opera, specif. as developed by Richard Wagner, characterized by a continuous flow of orchestral music, with an integrative use of musical themes (leitmotifs), and singing that is free from formal division into arias, recitatives, etc.
music drama definition by American Heritage Dictionary
An opera that avoids discrete numbers such as arias, recitatives, or ensembles, and in which the music reflects or embodies the action of the drama.