Xnoise is a lightweight fast media player, designed with a track-centric attitude in mind, allowing the user to play media via a simplistic interface yet packed with numerous plugins, configuration options, etc.
Usually, looking to properly develop applications for the Ubuntu desktop, is to "force" the third-party developers to integrate apps via Ubuntu's specific bits, both "internals" (such as Sound Menu, Unity launcher, HUD, etc) and external (like Ubuntu One Music Store), actions needed for a no-compromise fully-usable experience.