[Grammar] Is this sentence correct?

I've got the blues today.
Should blues be blue, right? Thanks.

No, the original is correct.

"The blues" (in addition to being a type of music) means general sadness.

If you have "the blues" you feel sad. You could say you "feel blue" but you've "got the blues."

羡鱼-Xianyu;554533 said:

I've got the blues today.
Should blues be blue, right? Thanks.

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***NOT A TEACHER***Xianyu, the plural (blueS) is correct. People use the singular in a sentence such as: I'm feeling blue today. Thank you.

Now I got it totally, thanks.