I'm new to win 10 mobile and I didn't know this either. It's useful to know. However, I came looking for a solution on how to shutdown Groove when it's been playing music. I can't get it to shutdown using this method. I have a Lumia 950 with Win 10 at 10.0.14393.448. Anyone able to help?

Edit
Groove actually shuts down but when I go back to the Start screen the Groove live tile still shows the last track I was playing and if I go back to Groove that track is ready to go again.

The big problem with this is when I get in the car the phone and the car connect (BT) and the music starts playing automagically. This stops the map app from using BT to give directions through the radio.