Can somebody recommend me some good gaming soundtracks?

[Millenium]

In my opinion the Halo soundtracks are just the best.

Favourite tracks:

Halo 1:

1. Halo
2. On A Pale Horse
3. The Maw

Halo 2:

1. Main Theme
2. Peril
3. Ghosts of Reach

Halo 3:

1. Greatest Jouney
2. One Final Effort/Three Towers
3. Wake Me When You Need Me

Halo 3:ODST

1. Overture
2. Rain
3. Traffic Jam

Just about every track on the soundtracks is great though :)