Who was Felix Mendelssohn's closest friend and confidant?

Bill Haley and His Comets and Elvis Presley recorded "Rock Around the Clock" and "That's All Right" respectively in what year?

A) 1946 B) 1951 C) 1954 D) 1957

When two hexachords share no tones in common, they are said to be:

a. transposed. b. complementary. c. inverted. d. serial.