For the series, see Syphon Filter Franchise.
For the first game, see Syphon Filter.
For the virus, see Syphon Filter Virus.
The Syphon Filter theme is the main song that is played through the entire series.
The Syphon Filter main theme is heard in the first three game's main menus. It is very short as compared to the version heard in the next three games.
Syphon Filter: The Omega Strain
The main theme is heard in the main menu once again. It has now been extended and places a heavy emphasis on instruments such as strings, a general orchestra and percussion.
Syphon Filter: Dark Mirror
The main theme is now revamped, sounding much darker and more negative than it was in The Omega Strain. It is also shorter, and a choir can be heard.
Syphon Filter: Logan's Shadow
The theme is again heard in the main menu for Logan's Shadow.