When Halo 2 was released, it was accompanied by a soundtrack. Unfortunately, it wasn't the soundtrack fans had been hoping for: instead of one featuring the music from the game, it instead pulled the old "music from and inspired by the game" trick. While a few game tracks could be found on it, including "Halo Theme Mjolnir Mix" and "Ghosts of Reach", it was also loaded with tracks by Breaking Benjamin, Incubus, and Hoobastank.
It was tolerable. The game-specific tracks were great, and a few of the "inspired by" tracks grew on you over time, but it wasn't the soundtrack we wanted.
Volume 2 is that soundtrack.

For decades, Dungeons & Dragons players have cobbled together custom soundtracks for their games from diverse sources, including various movie soundtracks (Conan the Barbarian, Lord of the Rings), game music tracks (Baldur's Gate, Neverwinter Nights) and even specialized albums (Midnight Syndicate, Toxic Bag Productions). But now they have an official soundtrack, one sanctioned by the Wizards of the Coast, and one that promises to bring cinematic sound to the gaming table.