 Kedok Ketawa was not the first contemporary film featuring a masked hero . Tan 's Film had released <unk> Item ( The Black Crow ) , with <unk> <unk> as the masked Black Crow , in 1939 , and later productions , including Java Industrial Film 's <unk> Item ( The Black Wolf ; 1941 ) , continued the trend . As was common for contemporary productions , the soundtrack for Kedok Ketawa – performed by <unk> – consisted of <unk> songs . 
