I know the answer to this is probably going to be no.....   ...but....   A standalone music player for iOS would be very useful.  Trying to get the wife to use the full client for music is just not happening.  Something that was simple and intuative and quick and easy to use would be killer, something like spotify.   The simpler the app is to use, the better.   If all else fails, I have a project that's on the back burner that was an iOS music player for subsonic, but I could always targ