Loudhailer

Loudhailer was a small and clean music player for the GNOME desktop written in Mono/C#. It used the gst-sharp library for working with gstreamer in C#. That library isn't developed any longer so neither is Loudhailer.

You can find the old code and some screenshots here.
(But it hasn't been tested against newer gstreamer releases (0.10.x) and I would be very surprised if it works)

christian at loudhailer dot org