S.H. here,
#1: With Guitar Hero and Rock Band, I can play between Hard and Expert on the guitar. # of stars depends on the song

#2: I've only tried singing on Med. but will try to practice on exptert, but this will be hard as I explain it in topics #3 and #4.
#3: I haven't downloaded ths song for Rock Band and only know the lyrics from my iPOD. Will try to get it from the PS3 store later.
#4: On the 23rd, my PS3 went out on me

, so it's currently in the shop. I won't be able to practice untill it is returned, hopefuly before the kon starts. If not, I'll post the bad news.
#5: The song is STILL ALIVE, it's either listed as being made by GLADOS, the PORTAL company, or by Shaun Guerin from the album "From Genesis to Shaun."
#6: The Bass Player can only do Med., will try to get him to be able to play hard, expert is slim to not likely. This will be hard as stated in topics #3 and #4.
#7: Are you guys looking for a specific difficulty or would you be allright with what the Companion Cube and bass player have to offer?
And #8:To AJ1059 and clooficarus, if you have any suggestion or other questions or what not, leave a post or send a personal message. YOUTUBE.com has videos of the song from the game, and even from Rock Band.
Awaiting your replies,
SherlockHolmes