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During the first three years of her pop-music career, Britney Spears released three albums, one each year.

The eponymous single from 1999s…Baby One More Timehit the No.

1 spot on Top-40 radio, but it only ascended to No.

On the 2000 year-end chart, Destinys Child, Aaliyah, and Janet all outperformed Oops!…

I Did It Again,the lead single from the album of the same name.

Now with a soundtrack of off-kilter beats and harmonic dissonance, Spears needed a new vocal approach.

We hear this transformation in the raspy breath and half-whispered vocals that bring up the song.

The melody is loose because this is a dance song, not a sing-along.

As she says, Dancings what I love now watch me.