Halo 3: ODST Original Soundtrack
From Halopedia, the Halo wiki
The Halo 3: ODST Original Soundtrack consists of music tracks composed by Martin O'Donnell and Michael Salvatori, is a two-disc set similar to the Halo 2: Original Soundtrack and Halo 3: Original Soundtrack.
As with the previous soundtracks, each music is made up of suites, and the suites are ordered to correspond with their in-game appearance. It was composed and produced by Marty O' Donnell and Michael Salvatori, and includes a complete 68 track listing inside. There are 17 songs on two discs.