MEOW:

The war is all over Etta's song, "At Last " -- Beyoncé sang the tune at Obama's 1st Inauguration Ball on Jan. 20th ... but last week at a concert in Canada, James was still pissed.

While on stage, Etta told the crowd, "Your President, the one with the big ears ... he had that woman singing my song. She gone get her ass whipped."

There's video at the link...