Music has a way of reaching people and almost all of us know that. If it's a powerful song, it can sneak right into our emotions, stay there and also turn into a message to us.
In my family, a good song can shift a mood, get everyone thinking especially that late evening when we are all together as one.
I think the reason why organisations use artists to drive their messages is that they know that when a message is wrapped in melody, people tend to remember it and also act towards it. I believed that songs have the power to push a society forward.