Graffiti has a strong relation with hip hop.My research has backed this up. with majority of hip hop vides having shots of Graffiti in them.

99 Problems (JAY Z) - http://www.youtube.com/watch?v=WwoM5fLITfk

Within the first 10 seconds, there are 2 -3 shots of graffiti in this video. This backs up my point about Graffiti having a strong relation to Hip Hop.

Today graffiti is still and will remain part of Hip hop.