There are over 40,000 recorded clips of Non Player Character (NPC) dialogue in Halo 3. That is more than twice times as many for Halo 2. Separate sound recordings were made for nearby and distant gunfire to make a more believable experience. Like Halo 1 and 2 the game has its own especially recorded classical soundtrack. The music was recorded with a 27 piece choir and a 60 piece orchestra.