What exactly do you mean? Every time you go in your car it automatically opens the music app? Or that every time you unlock your device it goes straight to the music app?
You could use Activator and set it to play the Music player as soon as something is plugged into the headphone jack. I have this setup and it's so helpful.
You could use Activator and set it to play the Music player as soon as something is plugged into the headphone jack. I have this setup and it's so helpful.