Harry Gregson-Williams 哈瑞·格里森-威廉姆斯曾是电影配乐界金字招牌Hans Zimmer工作室旗下一员，过去曾参与 过「绝地任务」、「埃及王子」等大制作，近五年来开始独立创作，他近期的作品包括「落跑鸡」、「全民公敌」、「间谍游戏」及「绝命铃声」、「纳尼亚王国传奇：狮子、女巫和魔橱」等作品，其中最引人侧目的是梦工厂动画大作「怪物史莱克」。他是相当受嘱目的新生代配乐家，出身于音乐世家的哈瑞从小就学习乐器，并常在欧洲巡回演出，加上日后扎实的音乐名校背景、和深入非洲中东等游历各地的体验，使他的音乐兼具专业深度和不羁的活力。 最初，《天国王朝》导演Ridley Scott邀请了曾经有过多次合作的Hans Zimmer，来为这部新作谱曲。当影片拍摄进入尾声时，由于Hans Zimmer个人的原因，经他的推荐，Harry Gregson-Williams接下了作曲的任务。 电影音乐里动员了123位唱诗班成员，以及一群来自伊斯坦堡的音乐家通力合作，在伦敦著名的Abbey Road录音室录制，擅长现代古典音乐手法创作的Harry Gregson-Williams，还采用了许多与影片时空相仿的乐器来彰显影片的历史背景，首先运用了中世纪的六弦提琴的冰冷寒颤的音色特质，拉开电影开场时的法国场景，等到男主角贝里昂踏进耶路撒冷时，Harry逐步让包括了阿拉伯的小提琴与打击乐器、手摇风琴在内的回教乐器以及拉丁乐器，搭配伊斯兰教的合唱团合声演唱，慢慢渗进充满了悲壮与哀荣色彩的主体交响乐章之中，让影迷跟着主角的圣战之旅，一起回到影片所呈现的时空之中，接受一场兼具心灵与感官震撼的史诗乐章的洗礼。值得一提的是具有埃及血统，出生于比利时的女歌手Natacha Atlas以阿拉伯文演唱合声，也为电影音乐覆盖了神秘的面纱。

Ketevan "Katie" Melua is a Georgian-British singer and songwriter. She moved to the United Kingdom at the age of eight – first to Belfast, and then to London in 1999. Melua is signed to the small Dramatico record label, under the management of composer Mike Batt, and made her musical debut in 2003.

Secret Symphony is the fifth studio album by singer-songwriter Katie Melua, and will be released on 5 March 2012. The album was recorded at Air Studios in London in collaboration with orchestrator and conductor Mike Batt. Melua said in a statement: "This album was going to be my 'singer's album'. I had always wanted to do this one day; singing other people's songs brings something out of you and your voice that isn't perhaps where you would have gone vocally with your own material." She added: "It stretches you. As it happened Mike and I did write a couple of new ones, but the general idea was to find songs by great writers such as Ron Sexsmith ('Gold In Them Hills') and a favourite song of mine, originally recorded by Bonnie Raitt ('Too Long At The Fair') plus some more well-known ones like Keeping The Dream Alive." The record will serve as the follow-up to Melua's 2010 album The House, which reached number four on the UK album chart.