Thanks to my friend hmrpotter we have some pretty interesting news about the Harry Potter trailers! Apparently, the music for the trailers is done by Magic Box Music, as seen in their portfolio.  They have done the trailer music for all the Potter films, you can watch/listen at the following links: Half Blood Prince, Order of the Phoenix, Goblet of Fire, Prisoner of Azkaban, Chamber of Secrets and Sorcerer’s Stone. They are currently working on Deathly Hallows Part I and II.

ONE WAY… ONE FATE… ONE HERO!
Once again Magicbox is hard at work on the latest Trailer for the final chapters of the Harry Potter Franchise. The Deathly Hallows will consist of two full length feature films released a year apart. Voldemort’s power is growing stronger. He now has control over the Ministry of Magic and Hogwarts. Harry, Ron, and Hermione decide to finish Dumbledore’s work and find the rest of the Horcruxes to defeat the Dark Lord. But little hope remains for them, so everything they do must go as planned.