What was the most enduring new musical style of the post-WWII decades?

According to the author, who was "the most uncompromising American Realist" of the second half of the nineteenth century?

a. Winslow Homer b. Thomas Eakins c. Henry O. Tanner d. Mary Cassatt

Alan Freed supported the original hits by rock and r&b musicians, both white and black, instead of the sanitized _______________________

Fill in the blank(s) with correct word