For a documentary filled with such joyous, danceable beats, there's still a note of sadness playing through "Sample This." It's not surprising, given this is a film bookended by deaths. Despite how adept he was at running game, Viner could only outsmart cancer so many times. Amy Winehouse, who also sampled "Apache," gets enough screen time to remind us of her tragically short life. Michael Melvoin, to whom this film is dedicated, died after filming his interviews. And Jim Gordon's story is so horrifying and tragic that it blindsides "Sample This" to a point from which the film barely recovers.