These tracks were made available on ITunes for pre-orders of the soundtrack. Full versions! There are five music so far, and all of them are amazing!! Features the new Halo theme!!! it is amazing!!!
http://youtu.be/4LLcP7pcIWU
Look on the user profile for all 5 tracks!
Mods: I guess this isn’t a leak since 343 likely authorized the distribution of these tracks?