True drama can be conceived only as resulting from the collective impulse of all the arts to communicate in the most immediate way with a collective public. . . Thus especially the art of tone, developed with such singular diversity in instrumental music, will realize in the collective artwork its richest potential -- will indeed incite the pantomimic art of dancing in turn to wholly new discoveries and inspire the breath of poetry no less to an undreamed-of fullness. For in its isolation music has formed itself an organ capable of the most immeasurable expression - the orchestra.