Possible Android Car Stereo Kitkat 4.4.4 Audio Override app?

[AC Question]

With the default music player there is no shuffle feature, only a replay one, and I was wondering if there are any apps out there that not only include the shuffle feature but the ability to override all other sounds that are currently playing. For example if I have my car radio playing and I open my default music player, it stops playing the radio and starts playing music, but when I download a music player from the google play store the radio continues playing with the music at the same time.