Hmm, XTIAN, an interesting and original question indeed. Britney has so many amazing songs it's really difficult to pick just one. I'm sure it'll take quite some time for most people here to figure out their absolute favorite, as they will have to consider each one carefully.
Anyway, after giving it some thought I'll have to go with Born To Make You Happy! When I think about Britney's long and amazing career it is this song that shines above all others.
...Baby One More Time: Soda Pop
Oops I Did it Again: One Kiss From You
Britney: Lonely
In The Zone: Showdown
B-Side: When I Found You
Absolute Favorite: When I Found You
