Do you think it is advisable that conductors also use hand signals for dynamics? Why or why not?
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zhxx
Yes, because it interpret the score in a way which reflects the specific indications in that score, set the tempo, ensure correct entries by ensemble members, and "shape" the phrasing where appropriate. Conductors communicate with their musicians primarily through hand gestures, usually with the aid of a baton, and may use other gestures or signals such as eye contact.
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