Deus Ex/Awesome Music

Note: In the Youtube links by Phreak761 the subtracks play in this order: Ambient, Game Over, Combat, Dialogue and, if available, Exit Area. Combat and Dialogue sometimes get switched, though.

Deus Ex has an epic soundtrack, especially the main theme, the intro music and "The Synapse" (Hong Kong Streets 1). It's worth noting that the 90% of the music was composed by Alexander Brandon and Michiel van den Bos, otherwise known for their work in the Unreal and Unreal Tournament soundtracks.
- The Paris section gives us a nice faux-orchestral arrangements of the main theme.
- Despite that the game fell short of many players's expectations, the main theme remix of Invisible War deserves mention.
- And then there's The Nameless Mod, and The Nameless Theme...
- Say what you will about the PlayStation 2 port Deus Ex: The Conspiracy, the orchestral remix of the main theme is pretty epic.
The UNATCO HQ theme, especially the dialogue subtrack.
- Same goes for when JC returns to UNATCO HQ on less than warm terms.
Battery Park themes.
Wandering through Hell's Kitchen just to listen to this.
- Ditto for when it is under Martial law.
Lebedev's themes, for when the plot is about to really hit off.
Shady Conspirators like the Majestic 12 need the shady cool music.
Besides the Streets theme, Hong Kong also has Ghost in the Shell-like Canal theme.
The MJ12's front corp. Versalife theme.
The theme for dealing with the former shadow masters of the world.
The Area 51 themes, setting up the climax.
The Ending Themes.