Christina Aguilera — Genie in a Bottle
The summer song of 1999, a three-minute explosion of vocal runs and pop perfection that launched a teenager into superstardom. "Rub me the right way" sent pearl-clutchers to their fainting couches while every radio station played it anyway. The second best-selling single of the year, triple Platinum, and famous enough that Blink-182 parodied it months later.