Question

guido darezzo contributed to the development of:

a. direct psalmody.

b. musical instruments.

c. musical notation.

d. time signatures.

Explanation:

Guido d'Arezzo is known for developing the modern musical notation system, including the use of the sol - fa (do - re - mi) system and the staff - based notation. Option A: Direct psalmody is not his main contribution. Option B: He was not primarily known for developing musical instruments. Option D: Time signatures were developed later and not his main contribution.

Answer:

C. musical notation.