Lisa is scouted by the director of the Capitol City Philharmonic, to her band teacher's dismay. Homer works extra shifts at the plant so Lisa can play, putting strain on the family.

On a family vacation to Niagara Falls, Lisa is mistakenly granted political asylum in Canada. When Marge goes to rescue Lisa, they are forced to re-evaluate their love for America as they navigate the polite Canadian landscape. Meanwhile, Homer takes Maggie to a "Daddy and Me" class.