The following Rock legends become available for purchase at the 'Character Select' screen when you complete their indicated task.

Unlock Billy Corgan:
In Band career play the song 'Today'.

Unlock Sting:
In Bass career play the song 'Demolition Man'.

Unlock Ozzy Osbourne:
In Vocals career play the Ozzfest gig.

Unlock Hayley Williams:
In Vocals career play the song 'Misery Business'.

Unlock Travis Barker:
In Drum career play the song 'Dammit'.

Unlock Ted Nugent:
In Guitar career beat his guitar battle.

Unlock Zakk Wylde:
In Guitar career beat his guitar battle .

Unlock Rockubot:
Complete the drum career.

Unlock Skeleton:
Complete the vocals career.

If you want to unlock the following features in the game then go to the 'Main' menu and select 'Options' followed by 'Cheats'. Then click on the 'Enter New Cheat' selection and enter the following codes to activate the corresponding effect in the game.

Unlock Hyperspeed:
Press Green, Blue, Red, Yellow(2), Red, Green(2).

Unlock Performance Mode:
Press Yellow(2), Blue, Red, Blue, Green, Red(2).

Unlock Quickplay:
Press Blue, Blue, Red, Green(2), Blue(2), Yellow.

Always Slide:
Press Green(2), Red(2), Yellow, Red, Yellow, Blue.

Unlock Air Instruments:
Press Red(2), Blue, Yellow, Green(3), Yellow.

Unlock Auto Kick:
Press Yellow, Green, Red, Blue(4), Red.

Unlock Aaron:
Press Blue, Red, Yellow(5), Green.

Unlock Nick:
Press Green, Red, Blue, Green, Red, Blue, Blue, Green.

Unlock Johnny Viper:
Press Blue, Red, Blue(2), Yellow(3), Green.

Unlock Rina:
Press Blue, Red, Green, Green, Yellow(3), Green.

Unlock Invisible Characters:
Press Green, Red, Yellow(3), Blue(2), Green.

Unlock AT&T Ballpark:
Press Yellow, Green, Red(2), Green, Blue, Red, Yellow.

Unlock Flame Colour:
Press Green, Red, Green, Blue, Red(2), Yellow, Blue.

Unlock Gem Colour:
Press Blue, Red(2), Green, Red, Green, Red, Yellow.

Unlock Star Colour:
Press Red(2), Yellow, Red, Blue, Red(2), Blue.

Unlock Vocal Fireball:
Press Red, Green(2), Yellow, Blue, Green, Yellow, Green.

Unlock Line 6:
Press Green, Red, Yellow, Blue, Red, Yellow, Blue, Green.