Why Do Radio Stations play The same Playlists? Give your views

I have noticed for some time now that all the commercial radio stations in Coast  that I can tune in to seem to have the same play lists.  You see, I'm a bit of a channel surfer, when I hear a song I don't like or that has been over-played I will change station.
I tuned sometime last week to some radio station and they were playing certain songs, I changed to another and they were playing almost the same songs. Its actually a different order of the same songs.
I want to know what exactly is going on here.  Why are all the commercial radio stations playing from the same play list, sometimes in a different order.
Leave your comments down here on what you think about this.
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About Walexx

He is the CEO of Cityville Mombasa. Reach him on 0728622801 or gangsta6g@gmail.com