Other mistake: In the scene where Bartleby Gaines is about to speak to the group of people, he starts to adjust microphone and there is feedback heard, but in the next scene you see Rory at a sound board that has nothing plugged in to it, e.g. microphone cables, speaker cables.
Other mistake: When Bartleby is at the court room he said "Sunshine!" And the board of lessons comes in, but when the group entered to find out where there court room is, there's no evidence of them bringing the board in, and even if the student's brought it in, Bartleby wouldn't know the board was behind the door because he stated he didn't know the student's were coming.
Answer: It's Holiday, by Green Day.