Originalno: Zeitgeist. Six Tableaux for Two Amplified Pianos, Book 1. George Crumb. Piano sheet music. Zeitgeist. composed by George Crumb. 1929-.
Prevod: 17 januar 1988. Šest tableaux za dva klavirja ojačeno, Book 1. Klavir note. Šest tableaux za dva klavirja ojačeno, Book 1. 1929 -.