Chalk outlines and old blood wash away, but the scars, memories, and family members left behind last forever. Of course Rich Boy and Big Gada aren’t worried about that right now. On “Murder Scene” they live in the moment. They’re only concerned with the body dropping to the ground when the shot is fired. The eyes widening with curiosity when the sparkler laden bottles all float in one direction like oversized fireflies. And the expensive foreign car exciting fantasies in the minds of children so impoverished that it seems a dream.