john petrucci-as i am

[AlexBLA]

iv seen 2 different versions on tabs... did he drop tune(something like 2 steps down) or did he use a 7 string?

[Jeff]

drop tuned on a 6

[lyconxero]

Yeah, he's playing in standard tuning 2 full steps down "C-F-Bb-Eb-G-C"

On the Ernie Ball website, there's a clip of him playing a little bit of the song while he shows off the strings that he used.