I mentioned this on G+, I'll do it here again, just for the sake of completeness. If you could do something like a media control app, similiar to media utilities (which fucks up big time on L) you would have a number of definitely grateful people at your disposal. Media Utilities was useful to draw media info from a lot of media players (which use some sort of android API). Including: Track Name, artist info, album info, progress. Control was also available.