It's been stuck in your head since Chicago won the World Series earlier this week ... but this is probably the best rendition of the classic "Go Cubs Go" victory jam you'll ever see.
The cast of the crazy popular "Hamilton" musical in Chicago paid tribute to the champs Thursday night, singing the corny yet super catchy tune to honor the Cubbies.
The vid is amazing ... and the cast even waves the 'W' flag onstage.
Go ahead, sing along ... no one's looking.
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