Which of the following would a critic focus on in order to describe an idiom or genre?
A. how different each musical composition sounds within one genre
B. the similarities of the genre to the decades of music styles that came before it
C. typical rhythmic patterns and instrumentation used in many songs within the genre
D. how varied the dynamics are in the many pieces from the genre

Which characteristic would be important to compositions in all genres?
A. steady tempo
B. electric guitar
C. improvisation
D. lyrics