Albus is a small application written in Python using the PyGTK framework that allows you to display album artwork on your desktop, with each album cover linked to a directory (presumably one containing media files... such as music files... such as that album's tracks... getting the idea?). From each album cover you can open the album's directory and queue or play its media files with customizable commands (depending on the player).
It was inspired by the late, great Clutter, an old Mac OS X application for the PPC architecture. I'd link you to it, but the developer's website has disappeared and the application now exists most visibly at http://osx.iusethis.com/app/clutter
Albus is not a music player -- it's meant to be used in conjunction with a music player, as a pretty-looking interface. I've used it successfully with VLC, Totem and MPD (via both Sonata and MPC). Basically, any music player that lets you queue items from the command line will work.