This is a theme for the full-screen display of Kirocker Music Display, version 4 and later.

Kirocker Music Display is both a panel applet and a full-screen display to see what's you're listening to in Amarok, and control the playback.
You can download Kirocker Music Display here:
http://www.kde-apps.org/content/show.php/Kirocker+Music+Display?content=52869

To install the theme, just open the archive file (the file ending with ".kirocker-theme.tar.gz").
Alternatively, you can launch the full-screen display of Kirocker Music Display, open the "Choose Theme" window, click "Import..." and browse to the archive to install.

Copyright information:
The background image origin and license is unknown.
If you are the author of the image, or know how to contact him/her, please send me an email to correct those information, or to remove the theme if the author wants to.