I tried this little player (Aqulung) and seems working well. It is simple to use and it keeps its connections with jack then you can play stop and so on one or more playlists that you can create and save. I used Clementine but it deconnects when you change track or stop... Clementine keeps connections with jack only when you let it playing the playlist without interruptions! Gmaq said (on another topic) that it Clementine use gstreamer! In fact Aqualung is simple but usefull and powerfull!
Maybe it can be a player usable in many contexts (situations).
Have a look:http://aqualung.factorial.hu/