343 has revealed the composer of Halo 4's soundtrack to be Neil Davidge. They've also released a sample of what's to come. You guys can check it out here. You'll have to scroll down for both videos.

I love the sample. It's ominous, and the beginning makes me feel like there's truly a terrifying threat. It's exciting, it's adventurous. It's all of this and more, but it still sounds like Halo to me. I can't wait for the rest of the music.