Re: DJ's lie more than politicians! (If that's possible)
That's just the top hits radio stations, and it's not new.
In the 70's there were two local Radio stations popular with us kids that only played the top 40 chart songs so you would never hear anything that had not already become popular some place else. On the weekend they would play oldies... the top 40 from a year ago.
It was Disco that made me look beyond the hit machine to find there was a lot more music out there to be found.