This happens because on gconf, the default music player is Rhythmbox (see bug# 729952). If you open 'Preferred applications' and set your music player as Banshee, the icon will appear on dash.
This happens because on gconf, the default music player is Rhythmbox (see bug# 729952). If you open 'Preferred applications' and set your music player as Banshee, the icon will appear on dash.