[1] The term spatialisation is connected especially with electroacoustic music to denote the projection and localization of sound sources in physical or virtual space or sound's spatial movement in space.
There are at least three distinct categories when plural events are treated spatially:[2] Examples of spatiality include more than seventy works by Giovanni Pierluigi da Palestrina (canticles, litanies, masses, Marian antiphons, psalm- and sequence-motets),[3] the five-choir, forty- and sixty-voice Missa sopra Ecco sì beato giorno by Alessandro Striggio and the possibly related eight-choir, forty-voice motet Spem in alium by Thomas Tallis, as well as a number of other Italian—mainly Florentine—works dating between 1557 and 1601.
[4] Notable 20th-century spatial compositions include Charles Ives's Fourth Symphony (1912–18),[5] Rued Langgaard's Music of the Spheres (1916–18),[6] 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,[7] Karlheinz Stockhausen's Helicopter String Quartet (1992–93/95), which is "arguably the most extreme experiment involving the spatial motility of live performers",[8] and Henry Brant's Ice Field, a "'spatial narrative,'"[9] or "spatial organ concerto,"[10] 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.
[11] Technological developments have led to broader distribution of spatial music via smartphones since at least 2011,[12] to include sounds experienced via Global Positioning System localization (BLUEBRAIN,[13] Matmos,[14] others) and visual inertial odometry through augmented reality (TCW,[15][16] others).