Nitin Sawhney composed the music for the soundtrack. It was performed by the Prague Philharmonic Orchestra conducted by Stephen Hussey. Tameem Antoniades of Ninja Theory said "we have our big orchestral soundtrack but we wanted to add a more ethnic element and marry those two together. There are actually very few musicians in the world who are experts in both areas. Nitin Sawhney is one of them." Sawhney stated that his creation of "musical textures take in everything from Hollywood, European and Chinese cinema to Indian and middle eastern instrumentation through the orchestras and soloists hovering between sonic tidal waves and reflective moments of intimate grace."
Nariko's warrior clan believes in a prophecy of a mighty warrior sent from the heavens with a godly blade (called the Heavenly Sword), to defend them from the ultimate evil. When the warrior was finished with his task he left the blade behind on earth. Many men were immediately drunken with the desire to wield its power and murdered over its ownership. It was then that Nariko's clan ended the violence and took on the dangerous undertaking of protecting the sword from such corruption.
The clan believed that one day a predestined male heir would be born and reclaim the sword as its rightful owner. Once this happened, peace and tranquility would return to the land and none would fight over the sword anymore. Their hopes were dashed however when the prophecy was nullified as Shen's wife produced not a male child but rather a female child (Nariko) while dying in childbirth. Shen was first tempted to murder Nariko but guilt swayed him, and instead he brought the girl up and trained her to be a warrior.