This developer video for Halo 4 shows how the musical score was created for the upcoming sci-fi game.
Halo 4 - Spartan Ops Episode 6
The sixth CG episode of Halo 4: Spartan Ops is now out.
Halo 4 Spartan Ops - Episode 2
Here is the second CG episode created for Halo 4's Spartan Ops.