Really digging Tears of the Clown by Iron Maiden.  From what I've heard, Steve Harris wrote it about Robin Williams' death.
Edit:  Some truth to the song being about Robin Williams.
"My favorite song [on The Book Of Souls] is one I didn’t write. It’s ‘Tears of a Clown,’ which talks about Robin Williams. I ask myself how could he be so depressed when he always seemed to be so happy."
 -Bruce Dickinson