听力原文：M: Hi, Nice to see you again !
W: Hi! I haven't seen you for quite a long time. What are you doing these days？
M: I'm taking a country music course.
W: Oh, really？ How interesting! What are you learning from the course？
M: A lot of things, you know, such as the history of country music, singing, and how to play a guitar.
W: That's great. Well, talking about country music reminds me of a famous singer, John Denver. Have you ever heard of him？
M: Sure. His song "Country reads take me home" is popular both in the USA and in China.
W: Yes, that's true. Did you hear the had news about him？
M: what was it？
W: He had an accident while flying his plane alone, and he was killed.
M: That's a big loss for country music.
Which of the following is not mentioned？

A. The teacher.
B. A pop star.
C. Playing the guitar.