"Smile" is a song based on an instrumental theme used in the soundtrack for the 1936 Charlie Chaplin movie "Modern Times". Chaplin composed the music, while John Turner and Geoffrey Parsons added the lyrics and title in 1954. In the lyrics, the singer is telling the listener to cheer up and that there is always a bright tomorrow, just as long as they smile.
The song was originally sung by Nat King Cole, charted in 1954. It was also covered by Cole's daughter, Natalie, on her 1991 album.

Smile though your heart is aching
Smile even though it's breaking
When there are clouds in the sky, you'll get by
If you smile through your fear and sorrow
Smile and maybe tomorrow
You'll see the sun come shining through for you

Light up your face with gladness
Hide every trace of sadness
Although a tear may be ever so near
That's the time you must keep on trying
Smile, what's the use of crying?
You'll find that life is still worthwhile
If you just smile

That's the time you must keep on trying
Smile, what's the use of crying?
You'll find that life is still worthwhile
If you just smile