If you've been caught belting out "Love Is an Open Door" in the car (ahem, even without your kids), you're not alone. And thanks to Frozen 2's actors' pipes, you can count on a whole new soundtrack of songs to sing with the kids. While there are about a dozen new songs in the flick that your kids will fall in love with, "Into the Unknown" is a true bop that's honestly still stuck in my head days later.