While rap music has continued to become more popular. Overall, the quality of good modern music has declined.
One important signal of modern musics decline is the decreasing % of radio stations that play it. More and more radio stations are changing to some form of talk radio to stay in business. (news, sports, political)
Modern music genre is now so fragmented, downloading your favorite music online is becoming the better option over radio stations. Not sure if this is a good thing for the financial future of music, or not? But at least I don't have to suffer listening to rap and the other bad modern music genres.