Today’s piece is Also Sprach Zarathustra by Richard Strauss. It was made popular in the 1968 Stanley Kubrick science-fiction movie 2001: A Space Odyssey.
The organ part in this snippet looks pretty easy.
Just the main theme for piano
A piano reduction of the whole orchestral score
Tee orchestra playing the entire word
Just the opening of 2001: A Space Odyssey
The Blue Danube Waltz composed by Johann Strauss (no relation) was also used in this movie.