Yeah, he has beaten every song on Expert that I know of. He's always showing me these YouTube videos of these kids who can conquer "Six" by All That Remains on Expert without any difficulty. I saw one addict get a 98% on that song. Personally, I love ATR and a ton of metal/emo music. But the funny thing is, even though I have been playing on Expert for almost a month, I cannot seem to beat "Six" on Hard lol; only medium. Every time I play it, my mind and heart begin to race like I'm running a marathon or something. I've tried beating it on and off for month; I'm getting better, but haven't completely beaten it yet.
On a sidenote: A friend of mine who lives in my dorm[ is like an uber game hacker. He read on the internet somewhere how to change the songs in the game and add his personal favorites. I remember him telling me how it took him literally all week to successfully add ten songs on GH2. Once he finished, we began playing a ton of awesome shit. He put up "Through the Fire and Flames" by DragonForce, "Welcome Home" by My Chemical Romance, "Californacian" by the Red Hot Chilly Peppers, two songs by Children of Bodom, and like thirty others. It totally changes the game experience once you're able to put forth your own stuff. Heh, I love this game.