from the Older post but interesting dept.
“Creating a massively multiplayer game can take several years and is akin to designing an alternate universe. It involves lots of artwork, animation, and software programming. While a feature film might have two or three hours of music written for it, for instance, a team of composers at 38 Studios is writing 80 hours of music to accompany every possible game scenario. Additionally, the environments and characters are sketched first, then built in the computer as 3-D digital objects. Then, there must be testing. WoW was in development for five years.”
Link to The Boston Globe