What did the greeks use to establish ideal proportions in the human body architecture and other forms of art

The Greeks used a rectangle to establish ideal proportions.

Would it be an oboe?

Beethoven was a deaf man and couldnt hear. he became famous for his classical pieces. and there ye go.vivaldi was a true one hit wonder classical artist. hes known for his classical piece the four seasons. he was although wasn't as great as beethoven and yea 'ere ye a go.