What is the hardest song on rock band 2

On the Game Disc:

Guitar: Painkiller by Judas Priest
Drum: Panic Attack by Dream Theater
Bass: Panic Attack by Dream Theater
Vocals: Tangled Up in Blue by Bob Dylan

Download Able Content:

Guitar: Satch Boogie by Joe Satriani
Drum: What a Horrible Night to Have a Curse by The Black Dahlia Murder
Bass: What a Horrible Night to Have a Curse by The Black Dahlia Murder
Vocals: They're Red Hot by Red Hot chilli Peppers