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.
Answer:When you’re working in difficult lighting conditions say a contrasty midday scene a backlighting situation or a scene that’s very dark or very light it can be difficult to determine the correct exposure.
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East Sussex England
hope that helps
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There is no picture please add a picture for me to help you
