"the walls converge" is an example of music.
a. non-diegetic
b. postmodern
c. neoclassical
d. diegetic"the walls converge" is an example of postmodern music.

The best and most correct answer among the choices provided by the question is the second choice. Your answer that the Walls Converge" is an example of postmodern music is correct. I hope my answer has come to your help. God bless and have a nice day ahead!