This piece began as the finale of my opera, for solo acapella S/A/T/B voices. It has subsequently been performed by various choirs over the years, usually with the piano helping out on parts. Please visit my mp3 site – www.mp3.com/miles-zarathustra to listen to a (slow) performance recording. The sibelius site includes a combination choir+piano-reduction score, and 2 part scores for choir and piano each separately. For a more pianistic version that's easier to play, please see the "chym ode/fugue" score on my sibelius home page.