Answers:
What it means is this: When there's a song, which means, usually that your heart is happy and "singing" you shouldn't just let it stay in your heart, you should "sing" it, which means acting on how your heart feels, which is happy and smiley.
When you're happy, show it.
I think it means that when you are happy , share your happines with those around you.
It is self explainatory.Have you ever heard of the nursery rhyme that says "If you're happy and you know it clap your hands'' It means verbalize what's in your heart.
follow your heart
if your happy and you know it clap your hands if your happy and you know it clap your hands. if your happy and you know then your face will surely show it if your happy and you know it clap your hands.
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