Guitar Hero World Tour

As you play through all the instruments and their Careers you will come across Musicians that can later be unlocked once beating them in a battle or performing with them. Once they are unlocked you can purchase them from the Rocker select screen, Hayley Williams costs $5,000 to purchase. You will be able to purchase her after you complete the 12th gig (Los Angeles) in the Vocals Career on any difficulty. Simply play any song as her in either Career or Quickplay.

-It is possible to play with Hayley Williams online before you purchase her, you must have her unlocked before you can select her though. To change your musician online select Preferences then Rocker.