[Grammar] It's not what you say, it's the way that you say it.

[kadioguy]

In the OALD9, it says:

way n.

It's not what you say, it's the way that you say it.
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Why are the two sentences connected by a comma? Is it a run-on sentence?

Thanks.

PS I also posted the same question on this, but all of your answers are unique to me. Hope we can discuss with each other. Thank you.

 

[teechar]

Strictly speaking, they shouldn't be. A semicolon or a full stop (period) is needed.

 

[GoesStation]

The text is two lines of a song. When quoting poetry or lyrics, we often replace line breaks with commas.