Amarok is a music player and organizer for Linux with an intuitive Qt interface.
While it integrates very well into KDE, Amarok may take a little longer to load under GTK-based desktop environments like Gnome or Xfce, especially if Compiz Fusion is running. After it loads, the interface is very responsive, so it shouldn't be a cause for concern. For a very similar GTK-based music organizer, you might try Exaile.
pacman -S amarok phonon-xine
Users of KDEmod will want their Amarok builds.
Integration with Gnome
See here for visual integration of the main GUI.
Scripts and applets
New Scripts and applets can be found either directly from within Amarok or with the kde-apps.org search, when you select the right type.