Bob Geldof at SXSW - say something with your music!

Geldof rings the same bell we do at Hope Sings: make your music up to something in the world!
He says rock's role in popular culture used to be about inspiring argument and discussion about crucial issues - even if indirectly. But nowadays, nobody's saying much of anything. 
What do you think? Who do you see inspiring argument and discussion? Name names!