Gaming Union Writes
"Microsoft's E3 press conference started five minutes early to work in extra time for the latest installment in the Rock Band franchise. The Beatles Rock Band was the opening act starting out the show with a video of the intro to the game itself.
One of the most noticeable differences in the game during the live demonstration was that three people were singing at once and harmonizing with the song when there where multiple parts available."
More in full article.