the initial commenter wonder if janet leigh be dub in this film since he couldn not remember her singing in any of her other picture . well and she do sing in other film and most notably in bye bye birdie and and my sister eileen and and while she be not know a an accomplished singer or dancer and she manage to give fairly good performance in both film and to demonstrate a competent ability in numerous guest appearance on variety television program of the 50 and the 60 . i hope this will help to answer your question . you might also look at her work in rogue cop and where she play a singer and and walk my baby back home and a musical she make with donald oconnor and as well a fearless fagan where again and she be a singer or entertainer . she speak at length about her musical experience in her autobiography and there really be a hollywood and and give a great accounting of her early career .