 The music was composed by regular series composers <unk> Sakuraba and Shinji Tamura . Sakuraba primarily worked on the battle themes and arrangements of previous themes , while Tamura handled selected boss battle tracks and created Reala 's theme . They were able to create more tracks with greater detail to them due to the expanded storage capacities of the PS2 . As with previous games , a licensed theme song was created by a Japanese artist for the game 's opening . For Destiny 2 , the theme song was " Key to My Heart " from the album Fairy Tale , by Japanese singer @-@ songwriter Mai Kuraki . Its lyrics were designed to " express the world " of Destiny 2 . <unk> of " Key to My Heart " were featured in the soundtrack . Unlike previous Tales games , where voice work was recorded out of order , the voice work was recorded in order of the game 's events to add dramatic weight to the performances . This consequently created difficulties with scheduling and put an added strain on the actors . 
