wondering

First of all, I think there are a few new songs as compared to our time during the 80s. Unfortunately, I assume only 2% are new and the rest are remakes and revivals. But to answer your question, this is all about business and product marketing. If the station is famous and influential, they will probably be among the first ones to play new songs. Producers will invest money to market the song and will not of course choose a poor station to promote it. Then, if the audience requested for that song again it means that that the DJ will play it over and over again until there will be another new one. During the 80s, there were a lot of shows that collect news songs and test them on air. There are the famous American TOP 40, Billboard, and some also are local here in the Philippines. But since the music industry is dying globally, only a few producers have the guts to invest money. If the golden days will be here again, there are at least 1 new song weekly. Thanks!