It's pronounced "ensemble" by the way. And, one way that a pianist would have a role would be by being in the background as an example and playing his part. He's going to play what he needs to play. The question does seem a little to vague, but truly, I would say simply, that the person who is playing it, just plays his part as they all make music sound good.
The answer would be B, Converting a color image in processing software.
Answer:
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