Spiritually speaking, why is pop music such crap these days?

I mean it's all mindless drivel about . Britney Spears, Lady Gaga, Lil' Wayne, etc. All they takes about is f*cking or some other crap and their music videos look like short soft movies. Why can't their be more music like Led Zepplin, Aerosmith, Bon Jovi and stuff like that?