I agree with petslover. It was bad, but blaming it on the band was the worst thing she could have done. If you listen, you can hear the band at the beginning start playing the correct song, and then her vocals come in for the other song "Pieces of Me." The band didn't know what to do, so they start playing "Pieces of Me" too, and Ashlee does this weird jig-thing while the band train-wrecks, and then just leaves the stage. Then she blames it on the band, saying they played the wrong song. No, they didn't. I don't know if she was planning to lip-synch or what (someone told me she lip-synched the first song?), or if she was using the vocals as a "guide" and was going to sing along with them, but I think she should apologize to her band, you know?

Here's a quote from Ashlee herself:

Lucky Magazine: "What are your takes on lip-synching?"

Ashlee Simpson: "I'm totally against it and offended by it. I'm going out to let my real talent show, not to just stand there and dance around. Personally, I'd never lip-synch. It's just not me."