Why Does the radio repeat the same songs and artists over n over again y can't they put some variety?

like theyre always playing drake wayne young money pitbull n stuff like bedrock then 6 minutes later they put up rhianna rudeboy then lady gaga and it's literally a repeating musical cycle like for a long time they dont atleast take a break and put on some other styles besides all these girl songs and dance songs they shood atleast include more artists so the viewers can listen like Skillz, Pimpzilla, KRS One the new songs Saigon talking about real stuff and decent lyrical ppl like what u here on the rap audio channel on Cable and Satelite