This intermittently amusing parody of the rap music industry starts out energetic and alive, then loses its inspiration and its nasty edge.

Tamra Davis, a musicvideo director with the well-received feature debut Guncrazy on her resume, might have really had something here had she settled on any one of the many paths the movie starts down.

Torn between celebration and sendup, CB4 misses its big target as often as it hits.

This freewheeling satire is uneven but always entertaining, and frequently hilarious.