For instance: may a singer say...

Now I'm gonna sing a blue I wrote twenty years ago.

Or should he say...

Now I'm gonna sing a blues I wrote twenty years ago.


Neither is correct; you should say "sing a blues song". But not "sing a blue song" - that might not be understood as referring to the musical genre at all.

Strictly speaking, sometimes the singular "blue" is used in this way; the Merriam-Webster dictionary records a meaning of "blue": "of, relating to, or used in blues" and gives a specific example of "a blue song". But this is a rare, possibly obsolete form. It's better to use only the plural form to refer to the genre.

  • 2
    Not so: a blues is quite common. For corroboration Google "played a blues in E" or something similar. – StoneyB on hiatus Oct 1 '19 at 0:24

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