I have a small Bluetooth media control. Volume, play / pause, and track controls work even if I've not got the music app up, or if I need to pause something to

I have a small Bluetooth media control. Volume, play / pause, and track controls work even if I've not got the music app up, or if I need to pause something to hop on a call. Not having to find my music app because my wife calls me from the other room is really handy.