What did cage do to the piano for his prepared piano pieces? a. he hung bells on each string to create percussion sounds b. he placed blots, screws, bamboo, and other objects in the strings to create percussion sound c. he put two sets of strings on it so each note struck a double set of strings d. he held the pedals down with tape so he could use a violin bow on the strings

The correct answer option is B. He placed blots, screws, bamboo, and other objects in the strings to create percussion sound.

Explanation:

A piano which has a sound that is altered by placing some objects between  the strings or on the strings is called a prepared piano.

Moreover, John Cage was the first music composer who used it extensively and was even considered its inventor.

He made use of blots, screws, bamboo, and other objects by placing them between and on the strings to create percussion sound.