 20,000 New Zealand cricket fans provided the sound of the Uruk-hai army in "The Two Towers", with Jackson acting as conductor during the innings break of a one-day international cricket match between England and New Zealand at Westpac Stadium.They spent time recording sounds in a graveyard at night, and also had construction workers drop stone blocks for the sounds of boulders firing and landing in "The Return of the King".Mixing took place between August and November at "The Film Mix", before Jackson commissioned the building of a new studio in 2003.