Complete the indicated task to unlock the corresponding guest.

Guest	How to unlock
Carlos Santana	Complete "No One To Depend On (Live)".
Johnny Cash	Complete "Ring of Fire".
Kurt Cobain	Complete "Smells Like Teen Spirit".
Matt Bellamy	Complete "Plug in Baby".
Shadow	Get a 600 note streak on "Lust For Life (Live)" in Career mode.
Shirley Manson	Complete "I'm Only Happy When It Rains".
Skeleton	Complete the Platinum or Diamond drum challenge on Brianstorm in Career mode.
The Golden God	Complete the Platinum or Diamond challenge on The God of Rock's Final Challenge in Career mode.