The filmmakers behind 'Iron Man 2'have brought in Australian rock legends AC/DC to provide a blistering soundtrack. All summer blockbuster films seem to require the same ingredients for success: 1) Hire an A-list cast to star as the hero, love interest and sidekick. 2) Guarantee plenty of action and explosions. 3) Make sure the soundtrack can match the volume of explosions in the film. And it doesn't hurt if the movie is a sequel to a blockbuster based on a comic book superhero.