This is a really weird time for top 40 pop music because it's so easy to shut it out completely. Thanks to the internet, we can dictate the media we're exposed to. This means that the only time I hear pop music is when I'm in public spaces (grocery stores, night clubs, etc.) In my mind, the most significant rapper right now is Danny Brown, but I'm vaguely aware that he's so weird and experimental that he must not be mainstream. And, of course, the mainstream is pretty much irrelevant to the indie/punk bands I follow, though I have some idea of which ones must be popular. Of course, every once in a while I do check out something in the pop world. Beyonce's Lemonade got so much buzz that I had to check it out despite previously hating Beyonce, and I'm glad I did - it's a great album. But for the most part I'm just oblivious.