Complete the indicated task in Career mode to unlock the corresponding character.

Adam Levine: Complete the Gig on Maroon 5's "She Will Be Loved".
Adrian Young: Complete the Gig on No Doubt's "Don't Speak".
Frankenrocker: Complete the Diamond Bonus Challenge on Fall Out Boy's "Sugar, We're Goin' Down".
Gwen Stefani: Complete the Gig on No Doubt's "Just A Girl".
Shadow Character: Complete the Gold Bonus Challenge on David Bowie's "Let's Dance".
Skeleton Character: Complete the Platinum Bonus Challenge on Poison's "Every Rose Has Its Thorn".
Taylor Swift: Complete the Gig on Taylor Swift's "Love Story".
Tom Dumont: Complete the Gig on No Doubt's "Just A Girl".
Tony Kanal: Complete the Gig on No Doubt's "Don't Speak".