Holy hell. I was actually at this taping. I feel ... so very old. D:
@lyianx Actually, that music is from The Megas. Specifically, from their "Get Equipped" album of MM2 songs. Still, just as geeky, and just as awesome. (That is to say: You need that album.)
So do I. <3
I like how, immediately before Katie says "American," at 17:25 someone in the audience says "American" and is hushed repeatedly.