▁of ▁Greek ▁myth ology . ▁ ▁Ex terior ▁ ▁Main ▁fa ç ade ▁The ▁principal ▁fa ç ade ▁is ▁on ▁the ▁south ▁side ▁of ▁the ▁building , ▁over looking ▁the ▁Place ▁de ▁l ' Op éra ▁and ▁termin ates ▁the ▁perspective ▁along ▁the ▁Avenue ▁de ▁l ' Op éra . ▁Four teen ▁pain ters , ▁m osa ic ists ▁and ▁sevent y - three ▁sculpt ors ▁participated ▁in ▁the ▁creation ▁of ▁its ▁orn ament ation . ▁ ▁The ▁two ▁g ild ed ▁fig ural ▁groups , ▁Charles ▁G um ery ' s ▁L ' H arm onie ▁( H arm ony ) ▁and ▁La ▁Po ésie ▁( Po etry ), ▁crown ▁the ▁a pe xes ▁of ▁the ▁principal ▁fa ç ade ' s ▁left ▁and ▁right ▁avant - cor ps . ▁They ▁are ▁both ▁made ▁of ▁gilt ▁co pper ▁electro type . ▁ ▁The ▁bases ▁of ▁the ▁two ▁avant - cor ps ▁are ▁decor ated ▁( from ▁left ▁to ▁right ) ▁with ▁four ▁major ▁multi - figure ▁groups ▁sculpt ed ▁by ▁François ▁J ou ff roy ▁( Po etry , ▁also ▁known ▁as ▁Harm ony ), ▁Jean - B apt iste ▁Claude ▁Eug ène ▁Guillaume ▁( Inst rument al ▁Music ), ▁Jean - B apt iste ▁Car pe aux ▁( The ▁Dance , ▁critic ised ▁for ▁inde c ency ), ▁and ▁Jean - Jose ph ▁Per ra ud ▁( L yr ical ▁D rama ). ▁The ▁fa ç ade ▁also ▁incorpor ates ▁other ▁work ▁by ▁G um ery , ▁Alexandre ▁F alg ui