Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Karloff Used His Own Singing Voice

Warner Oland played Chan for the thirteenth time and Boris Karloff co-starred in this somewhat overrated film. Music credits were shared with two others by none other than Oscar Levant. Boris Karloff's role was that of an operatic baritone. He actually used his own singing voice. Lee Chan was again played by Keye Luke.