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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I have no idea can u send me the pic thxxxxxx
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The treble clef located on the second line of the staff is called the second treble clef or simply the treble clef. In the baroque period it was known as the "Italian key". Currently in English and German it is called respectively "treble clef" ("treble clef") and Violinschlüssel ("violin clef").
honestly I have no idea
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I don't know much about foreign influences
