Tonight, I tried playing 3-player online coop at Guitar Hero World Tour on the Xbox 360. There were two of us here in person and one of my friends online. We tried getting a 3-player coop online game going, to no avail. I'm able to invite her to the game and she connects without any problem, but we can't start any game as we are. Is it required to be 4 players for online coop, or was there something missing?

I find it stupid that the game's manual gives no indication on how to get the online game going. Same goes for Rock Band, but at least we figured out how to do it, so that's what we played instead.