It's not by Richard Strauss, but one work of this type features a twenty-part chorus and was used at various points of 2001: 
It's not by Richard Strauss, but one work of this type features a twenty-part chorus and was used at various points of 2001: A Space Odyssey. That Gyorgy Ligeti work used only half the traditional text, unlike an earlier example by Verdi, which strongly features the trombone and was dedicated to novelist Alessandro Manzoni. Benjamin Britten created a variant of this type of work by using numerous poems by Wilfred Owen in his non-liturgical example for WWI, the title of which was preceded by the word "War." An emissary called "the grey messenger" commissioned one of these works, of which the composer only fully scored the "Introitus," so it had to be completed by Franz Sussmayer. FTP Mozart was working on what kind of work at his death, a Latin mass for the dead?
It's not by Richard Strauss, but one work of this type features a twenty-part chorus and was used at various points of 2001: A Space Odyssey.
Requiem