Chances are prior to playing Hatsune Miku: Project Diva f for the first time, you’d never heard of “vocaloids,” which are synthesizing programs for singing. Not only is it used to correct real voices, but also to create virtual singers. These vocaloids aren’t really found in the US, but they’re actually fairly popular in Japan. So what do vocaloids have to do with this game? Well, pretty much everything.