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Wilco - "Passenger Side"
If you've ever seen Wilco live, you know that this song inspires people to sing along, and really, what kids are looking for isn't that much different than what drunk adults with beards are looking for, so this works well. And no, it doesn't matter that it's about drinking and driving. You haven't lived until you've heard a 3-year-old sing the line, "You're gonna make me spill my beer if you don't learn how to steer."
Taylor Swift - "We Are Never Ever Getting Back Together"
If you're still going to sit there denying this song's many, many charms, then I honestly don't know what to tell you. It's just crazy, the whole thing, and your kid will think so too, I promise. If you're overly bothered by the admittedly heavy-handed faux-conversational stuff, I would recommend going back to 2010's Fearless and opting for "You Belong With Me," which is almost as much fun for kids and probably the best pop song of the past five years.
The Beach Boys - "Good Vibrations"
Like the Fleet Foxes song I mentioned a little earlier, but to a much greater degree, you'll be able to see this song work its way into the kid's head. It's almost cruel, maybe, but that's ok. They'll thank you later.