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Sorry i have to go ask somone else

Ithink that the answer is c

Musical notation is a system which is used to  visually represent music  pertaining to the ear  contend  with instruments or sung by the human voice through  the employment  of written, printed, or different symbols.in the western music tradition, the sound is represented in written form through musical notation.in musical notation, the pitch is indicated exclusively by the position of notes on the lines and spaces of the staff.

Focus on the shape of your mouth as you get higher the baxk of your throat shoukd open up more and and your stimach should be stiff idf your signing correctly from your diaphragm not your chest