Aerosmith bassist Tom Hamilton sees his summertime “Guitar Hero”-sponsored jaunt with ZZ Top as a sign of the times. “Actually, before ZZ Top, we’re putting together a huge ‘Guitar Hero’ contest in each city,” Hamilton said via telephone from his “little studio in his backyard” during an interview with LiveDaily. “The leaders of the competition are going to come up on stage before ZZ Top goes on and they’re going to play live on the giant screens. That’s going to be a freak fest for these peopl