Audio
The musical score of Portable Ops was composed by Norihiko Hibino, Takahiro Izutani, Yoshitaka Suzuki, Kazuma Hinnouchi, Nobuko Toda and Akihiro Honda.
The ending theme ("Calling To The Night") was composed by Akihiro Honda and arranged by Norihiko Hibino and Akihiro Honda, with vocals by Natasha Farrow and lyrics by Nobuko Toda. "Calling to the Night" was later featured in Metal Gear Solid 4 as an iPod track, and Nintendo's Super Smash Bros. Brawl as one of the songs played on the Shadow Moses Island stage. Recently the song was adopted in Metal Gear Solid: Peace Walker as a playable in-game track via the Walkman tool.
The soundtrack was first released in Japan on December 20, 2006.
Read more about this topic: Metal Gear Solid: Portable Ops