This song, Black Rain, is the most politically potent song Ben Harper has released in years. Anyone with any knowledge of his music knows that in the early '90's he recorded songs in support of racial equality and about the riots in Los Angeles.
http://evilvince.com/wp-images/BlackRain.mp3
There's the link. Evil Vince is the photographer for most of Ben Harper's tours and such, and does and apparently released this to song to him for the fans. Give it a listen, it's very moving.
*Edit*I left out the link to Evil Vince's website, where I got the tune from. Just to be fair, it's
http://www.evilvince.com/
The dude's a great photographer, so check it out.