. ▁After ▁the ▁music ▁was ▁put ▁down , ▁the ▁group ▁settled ▁in ▁Ad vision ▁Studios ▁in ▁London ▁to ▁record ▁the ▁vocals . ▁The ▁album ▁was ▁then ▁mixed ▁in ▁August ▁at ▁Tr ident ▁Studios ▁in ▁London ▁by ▁Brown ▁and ▁assistant ▁John ▁Brand . ▁In ▁the ▁three - month ▁period ▁of ▁putting ▁the ▁album ▁together , ▁R ush ▁took ▁just ▁one ▁day ▁off . ▁Cost s ▁of ▁the ▁album ▁were ▁calculated ▁to ▁be ▁around ▁$ 1 0 0 , 0 0 0 , ▁making ▁it ▁the ▁band ' s ▁most ▁expensive ▁album ▁at ▁the ▁time . ▁Dr um mer ▁Neil ▁Pe art ▁re called ▁the ▁band ▁were ▁exha usted ▁by ▁the ▁time ▁of ▁completion ▁and ▁took ▁a ▁six - week ▁vac ation ▁to ▁recover ., ▁while ▁Lee ▁explained ▁that ▁they ▁" gre at ly ▁under est im ated ▁the ▁level ▁of ▁over ach iev ement ▁that ▁ ▁were ▁shooting ▁for ". ▁ ▁Songs ▁ ▁Side ▁one ▁" C yg n us ▁X - 1 ▁Book ▁II : ▁Hem is pher es " ▁occup ies ▁the ▁album ' s ▁first ▁side . ▁An ▁ 1 8 - min ute ▁track ▁and ▁sequ el ▁to ▁" C yg n us ▁X - 1 ▁Book ▁I : ▁The ▁Vo y age " ▁on ▁A ▁F are well ▁to ▁Kings , ▁the ▁song ▁has ▁six ▁distinct ▁parts . ▁Initial ly , ▁Lee ▁had ▁a ▁different ▁idea ▁for ▁the ▁album ' s ▁center pie ce ▁track , ▁but ▁after ▁some ▁music ▁had ▁been ▁written ▁the ▁group ▁felt ▁it ▁right ▁to