I recently read Winifred Philips A Composer's Guide to Game Music and found it to be a huge help in developing music samples for video games. It offers a hollistic view of the entire industry rather than just hitting on the techniques used in creating video game music loops. The book starts off with a look at the tools every game composer should have in their bag before venturing into the world of game music. We each have a creative skillset and need to understand it before d