Fig. 4. First page of Alexander Scriabin’s Prometheus, the Poem of Fire(1911). TheTastiera per lucepart for colored light appears at the top of the score. Here, theupper voice (A) indicates the color to be projected (green) while simultaneouslyshowing the root of the famous six-note ‘mystic’ chord played by the orchestra.(Used by permission of Boosey and Hawkes Inc., copyright owners.)