This song was sung by Jermaine Jackson at the MJ Memorial on 8/7/2009. The song is written by Charlie Chaplin. In this video, the song is by MJ
Here are the lyrics for that song
Smile though your heart is aching
Smile even though its breaking
When there are clouds in the sky, you'll get by
If you smile with your fear and sorrow
Smile and maybe tomorrow
You'll find that life is still worthwhile
If you just
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 though your heart is aching
Smile even though its 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 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
"A day without a laugh is a wasted day." - Charles Chaplin
Hopefully it would work for me.