The harp is an instrument to play, which is often used in concerts and orchestras for background music. They were first found as arrows in Egypt (3000 BC), but were developed into a musical instrument.
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That note is a C. Hope this helps!
Illusionism is an approach that offers to explain a phenomenon as an illusion of thinking and perception, and not as a real phenomenon or a phenomenon that really has the properties that it seems to some people. In this sense, illusionism is opposed to "realism" in relation to the phenomenon.
B and a are the answers buddy;)