One of the definitive teen empowerment anthems of the Aughts, Stronger may be the song in Spears' catalogue most demanding of an emphatic sing-along. The track represents Britney at her spunkiest and teenybopper angst at its finest. Not to mention its accompanying video, which inspired many of the signature Britney traits we've come to love: emotive close-ups, chair dancing, and power-singing through the rain.