It makes me laugh that Louis-Justin's favorite song was recorded in 1958. My son is only 4 years old and he's crazy about this:
All I Have To Do Is Dream - The Everly Brothers
I like it too, but not as much as he does.
Some of his other favorite songs are:
Crazy - Gnarls Barkley
Reel 2 Real - I Like To Move It (in the movie Madagascar)
For those of you who have kids... What are their favorite songs?