I've paired my mobile phone with my Ubuntu 14.04 desktop via Bluetooth and can stream audio from the phone to the desktop using A2DP.
Every time I would like to know which song is playing, I have to glance at my phone. Since most car stereos are capable of displaying track information for music streamed via A2DP, I assume there is a similar method for getting this information to my desktop.
My searching failed to turn anything useful up. Is it possible to display a notification (via libnotify or something similar) when the current song changes? The app I'm streaming the music from is Google Music on Android, if that helps.