Katy Perry is proud of the “substantial lyrics” in her songs. The pop star told MTV in a recent interview that she’s glad that songs like “Firework” and “Teenage Dream” are “anthems” for people, and that she’s not only singing about the “materialistic world.” Read more at MTV.com.

From MTV News

What about Wiz Khalifa? If that song isn't a thesis on unhealthy obsession with material goods ... I don't know what is!

:)