I don't want to start w/o permission, in case I break something, but here's what I plan to do:
1. Create a new page called MediaWiki:Music-start. Add to it:
"<embed src="images.wikia.com/pixeldungeon/images "
2. Create a new page called: MediaWiki:Music-end. Add to it:
class="musicplay embedmusicall" />
3. Create a template called Template:MusicPlay. Add to it:
<div style="position: fixed; top: 0; left: 120%;" class="embedmusic"><verbatim>Music-start</verbatim>{{{1}}}<verbatim>Music-end</verbatim></div>
4. It may be a good idea to add something to the Terms of Use, as Any registered user can use this template! Still, it'd be nice.
P.S. I plan on adding the "Surface" theme to my profile after this :P