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I believe the reason there's a coma in this instance is because its in a musical, a song, so it needs the flow. Without the comma, the sentence would be an imperative - 'Be happy.'Don't worry!' You know, like 'Be happy'Don't worry. Period.!' And wouldwouldn't sound good in a song. Otherwise if it is justit's being written, most people would use two independent imperative statements 'Be happy! Don't'Don't worry! Be happy!' Also, Does it beg the sentiment being expressed would be better putquestion: Don't worry. Be happy. Because not having any worries would most likely makeare you worried about being happy!?

I believe the reason there's a coma in this instance is because its in a musical, a song, so it needs the flow. Without the comma, the sentence would be an imperative - 'Be happy.' You know, like 'Be happy. Period.' And would sound good. Otherwise if it is just being written, most people would use two independent imperative statements 'Be happy! Don't worry!' Also, the sentiment being expressed would be better put: Don't worry. Be happy. Because not having any worries would most likely make you happy!

I believe the reason there's a coma in this instance is because its in a musical, a song, so it needs the flow. Without the comma, the sentence would be an imperative - 'Don't worry!' You know, like 'Don't worry. Period!' And wouldn't sound good in a song. Otherwise if it's being written, most people would use two independent imperative statements 'Don't worry! Be happy!' Does it beg the question: are you worried about being happy?

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I believe the reason there's a coma in this instance is because its in a musical, a song, so it needs the flow. Without the comma, the sentence would be an imperative - 'Be happy.' You know, like 'Be happy. Period.' And would sound good. Otherwise if it is just being written, most people would use two independent imperative statements 'Be happy! Don't worry!' Also, the sentiment being expressed would be better put: Don't worry. Be happy. Because not having any worries would most likely make you happy!