One opera by this composer begins with a character forced to disguise himself as a chambermaid named "Mariandel," who is then propositioned by the crude Baron Ochs. That work by this composer centers on an aging princess who releases her much younger lover (*) Octavian. Another of this composer's pieces begins with the sustained notes C-G-C; that piece contains a "world riddle" theme. This composer who created the Marschallin in Der Rosenkavalier also wrote a work which 
One opera by this composer begins with a character forced to disguise himself as a chambermaid named "Mariandel," who is then propositioned by the crude Baron Ochs. That work by this composer centers on an aging princess who releases her much younger lover (*) Octavian. Another of this composer's pieces begins with the sustained notes C-G-C; that piece contains a "world riddle" theme. This composer who created the Marschallin in Der Rosenkavalier also wrote a work which appears at the opening of the film 2001: A Space Odyssey. For 10 points, name this German Romantic composer of the tone poem Also Sprach Zarathrustra.
One opera by this composer begins with a character forced to disguise himself as a chambermaid named "Mariandel," who is then propositioned by the crude Baron Ochs.
{R}ichard {Strauss} [prompt on "Strauss"; do not accept "Johann Strauss"]