From Team Fortress Wiki
"Haunted Fortress 2" is one of the song titles featured from the Team Fortress 2 Official Soundtrack, listed as track number eleven, and is one of 18 main menu start up themes. It is the eighth track to be added via patch subsequent to the game's release. It was released alongside the 2010 Scream Fortress Update Halloween event.
October 27, 2010 Patch (Scream Fortress Update)
- This song was added as main menu music.
November 19, 2010 Patch
- Fixed the holiday gamestartup sound files being included in the random startup selection after the holiday is over.
- The track features many different sounds available from the Noise Makers which were purchasable through the Mann Co. Store during the Halloween 2010 period.
- The track contains screaming sounds, used by the Witch in the Left 4 Dead series, at 0:32 and 0:43.