A. Scriabin: Prometheus or the Poem of Fire - Prométhée ou le Poème du feu op. 60 (Boulez)

Another marvellous piece by the russian composer Alexander Scriabin (1872 - 1915): Prometheus or the Poem of Fire op. 60 for piano, chorus, large orchestra and “luce“, sort of color organ which was supposed to create the synaestetical effects wished by the composer. Wikipedia about the color organ: “The part for color organ is notated on a staff of its own, in treble clef at the top of the score, and consists of two parts: one changes with the harmony, and always goes to the root note of the prevailing harmony, and thus produces the color Scriabin associated with each key; the other consists of much longer notes sustained through many bars, and does not appear to be related to the harmony (or therefore to the first part), but for the most part slowly rises up the scale a whole-tone at a time, the changes being several pages of score apart, or a minute or two apart. It is not clear what relationship this part has to the first part, or to the music as a whole. The score does not explain how two different color