It does and it doesn't. The modern pop music that's most formulaic seems to be there mainly because then the managers can concentrate on promotions without worr

It does and it doesn't. The modern pop music that's most formulaic seems to be there mainly because then the managers can concentrate on promotions without worrying about what used to be known as A&R. As an Olde Phart(tm), what DJs do looks very much to me like "a human avatar" and aggregator.