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