"Once upon a time everyone was a Justin Bieber. We were all kids and were having a great time. That's fine... But I do have grandchildren and even they play cool music. Everything is there for a reason. Justin Bieber does a lot of good for a lot of people, I just hope that he is a good boy at home." Rock legend Robert Plant hopes troubled pop star Justin Bieber, who is currently embroiled in a racism scandal, is a good boy at heart.