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.
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Impressionism is characterized as small strokes, that are still visible to the eye.
If you haven't seen Impressionism, one of it's best work is by Vincent Van Gogh such as "The Starry Night."
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Answer:
I would believe it. If this is true, they should trace the original artist by style, flaws, fingerprints, initials, etc.
