听力原文： Let me get straight to the point as to why we've gathered here today. Some stude

nts have requested a change in the music for this year's graduation ceremony. We are happy to announce that we've found a piece of music which may be a perfect replacement for the traditional marches that are commonly played during graduation. Since marches tend to be very repetitive, it was suggested that we try to find some more melodic music which might still be appropriate for the ceremony. We did some research and we've come up with an alternative that we hope you will appreciate. Since the standard graduation march is the song "Pomp and Circumstance" by Edwin Elgar, we looked through our music archives to see if we could find another piece by Elgar which was not so repetitive. Luckily, we were rewarded for our efforts by the discovery of a piece of orchestra music known as the "Enigma Variations" which may be just the answer to your requests. I'll play a tape for you in a few minutes to give you a taste of the music, and I'll also make the tape available in the library if any of you want to listen to it more thoroughly. We'll take a vote on the matter during the final rehearsal on the fifth. And remember, according to the committee rules, we shall not play the new song unless we have a vote of at least two-thirds in favor. Are there any questions？

What is the main topic of the passage？

A．The music of Edwin Elgar.

B．Traditional graduation songs.

C．The music for the graduation.

D．The alternatives to Edwin Elgar.