1. Did you install the fonts package?
2. What do you mean by "music player"? Are you referring to the While Playing Screen? If so, please use the proper terminology.
3. What theme are you trying to use?
4. What steps have you taken to install the theme that you are trying to use and load it?
You really need to (1) read through the manual before starting new threads and (2) when you do start a new thread, supply enough information to allow people to respond meaningfully.