单选题 The author considers the metaphors of masculinity and femininity we associate with certain pieces of music to be

• (A) external to the music, imposed in most cases by the interpretational criteria of critics and listeners
• (B) interesting but unnecessary for the enjoyment of these pieces of music by most listeners
• (C) evidence that socially-grounded codes are composed into music, and not simply the product of interpretation
• (D) a means by which familiar and well-loved music can be invested with new and arguably more positive values
• (E) evidence for a fundamental difference between the music of the avant-garde and more traditional varieties