What 'non instrument' did Tchaikovsky use in his 1812 overture?*

Instrumentation — The 1812 Overture is scored for an orchestra that consists of the following: Brass band: "Open" instrumentation consisting of "any extra brass instruments" available. ... band or its substitute is meant to play during the finale only. ... Not only did he deploy voices for the opening chant but he also

answerminaret;

the answer is b. false. a fugue is a traditional form of a composition in where a part would enter after the other and uses the same theme. the music would then grow constantly in size as well as in intensity.