Greetings, Lusavari!
Thank you for posting your concerns about the music. Just to make sure that we have everything covered for the report, can you please state whether or not you have experienced this on any other characters, or if any of your friends noticed the same trouble? Also, were you experiencing any connection troubles at the time? Finally, it would be a great help to us if you provided the following information:

Specify which version of Windows was in use to play the game.

ISP:
Name of ISP you use to connect to the Internet.

Type of Internet Connection:
Specify the type of connection. (dial-up, DSL, CATV, Optic Fiber, Other)

Internet Connection Speed:
Specify the speed of internet connection. (Example: 768Kbit/s, 5Mbit/s)

Date & Time:
Date and time of when the issue occurred. Please be sure to state the time zone of your region. (Example: Pacific Time = PST/PDT)

Thanks again for your participation!