The theme of the evening has been freedom, its processes and struggles and joys, whether iterated in the poetry-music of Scriabin and Beethoven or in the great escape from darkness and injustice that is Fidelio, Beethoven's only opera. The centerpiece of the show was Fidelio, flanked by choral preludes that speak of related themes, and two postludes, overatures that Beethoven ended up not using in the final version of his opera (which was revised and revised multiple times between 1804 and 1814).