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See her reaction after stopping down the show.

See the video.

From All-American Rejects to Yellowcard.

That's love.

Williams runs down what she's learned.

Beats anything the rest of us did as teenagers.

'[Swift] is really cool and did not deserve that,' Williams reflected.

'This Is Why' had a strong debut.

'It was an alternative scene for a reason – it was weird.'

See what she said.

Take a listen to the catchiest 'This Is Why' track yet.

See who will be playing Bonnaroo this year.