In Da Club by 50 Cent

Catchy beyond all reason for a rap song from this hack, but I can’t help but finish singing it once it’s stuck in my head.

Rockstar by Nickleback

Again, the catchy-ness makes up for it’s repetitive-ness.

Country Grammer by Nelly

Change the words “50 Cent” to “Nelly” in my first choice and that says it all.