I think it's the name of the group behind the mural.

http://www.heavyartillerycrew.com/

What boils my piss is that the media decide to spend two fking weeks mourning the loss of a crack head like Whitney Houston (ok she had a few merits in her early days but.....) and hardly mention the loss of a man that started a huge movement. Hip Hop was predominantly a black working class culture until (with the exception of Malcolm McLaren) the Beasties came along and, hip hop wasnt a mainstream style of music. After 1986 middle class white kids all over the world were now listening to hip hop which gave rise to acts like Eminem and the like. They made wonderful tunes with great videos, their tounges were planted very much in their cheeks and they made hip-hop fun again staying very much away from the whole gangsta thing. He will be sadly missed and as far as Im concern his music will be played a lot longer and louder than Whitney Houston's!