Notable 20th-century spatial compositions include Charles Ives's Fourth Symphony (1912–18), Rued Langgaard's "Music of the Spheres" (1916–18), Edgard Varèse's "Poème électronique" (Expo '58), Henryk Górecki's "Scontri", op. 17 (1960), which unleashes a volume of sound with a "tremendous orchestra" for which the composer precisely dictates the placement of each player onstage, including fifty-two percussion instruments, Karlheinz Stockhausen's "Helicopter String Quartet" (1992–93/95), which is "arguably the most extreme experiment involving the spatial motility of live performers", and Henry Brant's "Ice Field", a "'spatial narrative,'" or "spatial organ concerto," awarded the 2002 Pulitzer Prize for Music, as well as most of the output after 1960 of Luigi Nono, whose late works—e.g., "... sofferte onde serene ..." (1976), "Al gran sole carico d'amore" (1972–77), "Prometeo" (1984), and "A Pierre: Dell’azzurro silenzio, inquietuum" (1985)—explicitly reflect the spatial soundscape of his native Venice, and cannot be performed without their spatial component.