If you just want to play songs one after the other, you might be better off using a stand alone command line player like mplayer
it plays very nearly everything if you've got the right codecs.
Another option is gstreamer, which is the gnome media playing framework. It has a perl API and should also play a lot of different formats, but you might have to work your way through a lot of non-perl documentation to get it to work.
update: as for imaging, if you're going with GStreamer, GTK2 will probably integrate nicely and it has the nice
TK2::Canvas Gnome::Canvas interface that will let you do nice looking structured drawing.