<P> For the battle between the Last Alliance and Sauron's forces that begins the film, an elaborate CGI animation system, called MASSIVE, was developed by Stephen Regelous; it allowed thousands of individual animated "characters" in the program to act independently . This helped give the illusion of realism to the battle sequences . The "Making of" Lord of the Rings DVD reports some interesting initial problems: in the first execution of a battle between groups of characters, the wrong groups attacked each other . In another early demo, some of the warriors at the edge of the field could be seen running away . They were initially moving in the wrong direction, and had been programmed to keep running until they encountered an enemy . </P> <P> The digital creatures were important due to Jackson's requirement of biological plausibility . Their surface was scanned from large maquettes before numerous digital details of their skeletons and muscles were added . In the case of the Balrog, Gray Horsfield created a system that copied recorded imagery of fire . </P> <P> The musical score for The Lord of the Rings films was composed by Howard Shore . It was performed by the 100 - strong New Zealand Symphony Orchestra, the London Philharmonic Orchestra, the London Voices, The London Oratory School Schola, and the Maori Samoan Choir, and featured several vocal soloists . Shore wrote almost four hours of finalised music for the film (of which just over three hours are used as underscore), featuring a number of non-orchestral instruments, and a large number (49 - 62) of leitmotives . </P> <P> Two original songs, "Aníron" and the end title theme "May It Be", were composed and sung by Enya, who allowed her label, Reprise Records, to release the soundtrack to this and its two sequels . In addition to these songs, Shore composed "In Dreams", which was sung by Edward Ross of the London Oratory School Schola . </P>

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