Why is all music so hollow nowadays?

really Katy perry sings about peacock watching, Gaga sings about pretending to have sex with chicks, 80 percent of rap today in the mainstream has something to do with the intangible swag, Greenday has just sucked since American Idiot, whatever happened to mainstream music that had some kind of depth, this Drake guy goes in a Bieber video, Chris Browns a fool, Rihanna has no depth and only cares about her pocket. Its catchy but still **** with no content. Music isnt so you can have a fun time, its art in the medium of sound. Its easy to get a melody but to bring meaning to your song is so uncommon today, Eminem is the only guy and he is a money grubbing pussy. Seriously?