Quite a few for me but this thread came to mind today when " Everybody (Backstreet's Back) came on the radio. I don't think I even know any other Backstreet Boys songs but for whatever reason, this one I love.
Ditto "Dog Days Are Over" by Florence and the Machine. I've listened to that song many times, tried some of her other tunes but they did nothing for me.
So don't be shy, tell us your guilty music pleasures!