Review: much of it is funny , but there are also some startling , surrealistic moments ... 
Sentiment: positive

Review: do n't need to be a hip-hop fan to appreciate scratch 
Sentiment: positive

Review: ultimately empty 
Sentiment: negative

Review: an energizing , intoxicating documentary charting the rise of hip-hop culture in general and the art of scratching ( or turntablism ) in particular . 
Sentiment: positive


Review: give a backbone to the company and provide an emotional edge to its ultimate demise