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Charlie Chan at the Opera is considered by many to be the best Warner Oland Charlie Chan film, probably due to the presence of Boris Karloff as the principal suspect, as well as faux operatic music composed by Oscar Levant. This is the 13th film starring Oland as Chan; it was directed by H. Bruce Humberstone for 20th Century-Fox in 1936. Oland and Demarest also appeared in The Jazz Singer (1927). imdb.com