Here are the lyrics my mom recalls from a song that she played on the piano in the 40's as a teenager:
(she recalls the name Jerome Kern as being involved with this song in some way...wrote it? sang it??)

"smile sing and be joyful
... ...
a frown will never win you a friend
a sigh won't shorten a journey's end
in work and play be blithe and gay
drive sorrow and worry away"

She lost her sheet music and I need the title in order to find some replacement sheet music for her.
Thank you for any help you can provide finding the name of this song!