How about this, make a section of serios radio that can only be purchased by an adult or adolesent such as a card that you slide through, or an input code. This would make it so the younger children couldn't listen to it and would give parents some control they need.

Another thing, my bus driver in my old town played sexually explicit music on the radio WITH 1ST GRADERS. It wasn't just her, nearly every bus I have road on in three different towns has done this. 1ST GRADERS. our kids are not even safe ON THE BUSES. from music such as this.