What makes a career a success?  Is it selling 2.5 million copies of a debut album?  Is it being propelled into stardom with a second album that sold 7 million copies...powered by one of the most memorable videos ever produced?  

Or should we measure success in terms of lives touched, hearts moved, thoughts provoked?

Bono recently defended the automatic delivery of U2’s last album to 500 million iTunes users by asking what band wouldn’t enjoy having their music reach that many people.

But Sinéad O’Connor has not sold anywhere near as many albums as her fellow Irishmen.  Or concert tickets.  And yet, somehow, what she has to say is still getting heard around the world.  The sound of one person speaking her truth.