What does aesthetics include? check all that apply.

a. the determination of the worth of a piece of art
b. the philosophy of art
c. a belief that realistic art is more valuable than abstract art
d. a focus on how beauty is expressed and appreciated

I know its like a year late but its B, the philosophy of art and D, the focus on how beauty is expressed and appreciated.

Explanation:

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."