Originally titled “Interlude”, this 2002 breakthrough hit was one of the most popular songs of that year. To date, it remains the singer's biggest hit in the United States, and her only single to reach the top ten of the Billboard Hot 100. The singer has called the song "a combination of reality and fantasy. It's about a love that so consumes you that you do anything for it. That's how I felt at that time."
She wrote the song's piano riff in the summer of 1998 at her parents' house in Philadelphia; her mother, who had been listening to her, said, “...that's a hit song." But she was unable to finish the song because of a case of writer's block, and did not return to it for several months. While looking for a record label that would sign her, she played the beginning of the song for a record producer, who said, "You have to finish that." She returned to her parents' home and finished it in an hour one evening, naming it "Interlude."
Critics said this singer’s song “won favor with smart but awkward teenage girls who didn't see themselves in more evidently constructed teen-pop personalities like Britney Spears and Christina Aguilera"
And many of us heard it for the first time in Legally Blonde, the Reese Witherspoon classic.